Add files using upload-large-folder tool

25_dataset_caption.json

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+[
+  {
+    "folder": "dog-leg",
+    "first_image_desc": "Dog swimming underwater with front legs extended forward.",
+    "last_image_desc": "Dog swimming underwater with front legs bent backward.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog swims underwater moving its legs backward."
+  },
+  {
+    "folder": "meerkat",
+    "first_image_desc": "Two meerkats facing right with both heads visible.",
+    "last_image_desc": "Only one meerkat remains visible facing right.",
+    "challenge": "Linear motion",
+    "caption": "The right meerkat moves out of view to the right."
+  },
+  {
+    "folder": "knife",
+    "first_image_desc": "Hand holds a knife above a cabbage on a cutting board.",
+    "last_image_desc": "Knife slices down through the cabbage held by the hand.",
+    "challenge": "Dynamic motion",
+    "caption": "Knife slices downward through the cabbage."
+  },
+  {
+    "folder": "butterfly",
+    "first_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "last_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "challenge": "Near-static",
+    "caption": "Butterfly remains still on the yellow marigold flower."
+  },
+  {
+    "folder": "person-hand",
+    "first_image_desc": "Person in white outfit stands with arm relaxed at side.",
+    "last_image_desc": "Person in white outfit extends arm outward with open hand.",
+    "challenge": "Linear motion",
+    "caption": "Person raises arm and extends hand forward."
+  },
+  {
+    "folder": "elephant-apple",
+    "first_image_desc": "Man holds apple near elephant with trunk raised above water.",
+    "last_image_desc": "Man extends apple toward elephant with mouth open and trunk raised.",
+    "challenge": "Dynamic motion",
+    "caption": "Man extends apple toward elephant with open mouth."
+  },
+  {
+    "folder": "person-sunset",
+    "first_image_desc": "Person in water facing sunset with both hands down.",
+    "last_image_desc": "Person in water facing sunset with right hand raised to head.",
+    "challenge": "Linear motion",
+    "caption": "Person raises right hand to head in water at sunset."
+  },
+  {
+    "folder": "child-run",
+    "first_image_desc": "A child runs on a dirt path through green fields.",
+    "last_image_desc": "The child is farther along the path near the water.",
+    "challenge": "Linear motion",
+    "caption": "A child runs forward along a narrow dirt path."
+  },
+  {
+    "folder": "wood-shave",
+    "first_image_desc": "Person using a hand planer on a wooden plank.",
+    "last_image_desc": "Person has moved the hand planer further along the wooden plank.",
+    "challenge": "Linear motion",
+    "caption": "Hand planer moves forward shaving wood from the plank."
+  },
+  {
+    "folder": "run-smoke",
+    "first_image_desc": "Two people run on a beach with purple smoke.",
+    "last_image_desc": "Two people run forward on sand holding purple smoke.",
+    "challenge": "Linear motion",
+    "caption": "Two people run forward holding purple smoke on the beach."
+  },
+  {
+    "folder": "woman-arm",
+    "first_image_desc": "Woman in blue dress with arms bent, standing in field.",
+    "last_image_desc": "Woman in blue dress with arms outstretched, smiling in field.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman raises arms outward in grassy field."
+  },
+  {
+    "folder": "kangaroo",
+    "first_image_desc": "A kangaroo stands on grass near bushes, holding a red leaf.",
+    "last_image_desc": "The kangaroo stands on grass, raising its left paw higher with the red leaf.",
+    "challenge": "Dynamic motion",
+    "caption": "Kangaroo lifts its paw holding a red leaf."
+  },
+  {
+    "folder": "surfer",
+    "first_image_desc": "Two surfers with boards run toward the ocean on wet sand.",
+    "last_image_desc": "Both surfers are farther along the beach approaching the water.",
+    "challenge": "Linear motion",
+    "caption": "Two surfers run toward the ocean carrying surfboards."
+  },
+  {
+    "folder": "jog-tree",
+    "first_image_desc": "Person jogging away on a leaf-covered forest path.",
+    "last_image_desc": "Person farther along the same forest path under autumn trees.",
+    "challenge": "Linear motion",
+    "caption": "A person jogs forward along a tree-lined path."
+  },
+  {
+    "folder": "walk-snow",
+    "first_image_desc": "Two people walk away on a snowy forest path.",
+    "last_image_desc": "Two people walk farther down the snowy forest path.",
+    "challenge": "Linear motion",
+    "caption": "Two people walk away on a snowy path."
+  },
+  {
+    "folder": "goat-grass",
+    "first_image_desc": "A dark goat stands on green grass facing away.",
+    "last_image_desc": "The goat lowers its head toward the grass.",
+    "challenge": "Linear motion",
+    "caption": "A goat lowers its head to graze."
+  },
+  {
+    "folder": "rooster",
+    "first_image_desc": "A rooster stands on a branch facing forward with head turned left.",
+    "last_image_desc": "The rooster stands on the branch facing forward with head turned right.",
+    "challenge": "Linear motion",
+    "caption": "The rooster turns its head from left to right."
+  },
+  {
+    "folder": "suv-road",
+    "first_image_desc": "A black SUV is entering from the left on a dirt road.",
+    "last_image_desc": "The black SUV has moved further onto the dirt road from the left.",
+    "challenge": "Linear motion",
+    "caption": "A black SUV drives onto the dirt road from the left."
+  },
+  {
+    "folder": "dog-grass",
+    "first_image_desc": "A dog stands in tall green grass facing forward.",
+    "last_image_desc": "The dog is closer in the grass facing forward.",
+    "challenge": "Linear motion",
+    "caption": "A dog runs forward through tall grass."
+  },
+  {
+    "folder": "curly-hair",
+    "first_image_desc": "Hand holds a section of curly hair near the head.",
+    "last_image_desc": "Hand moves the section of curly hair outward from the head.",
+    "challenge": "Dynamic motion",
+    "caption": "Hand pulls curly hair outward."
+  },
+  {
+    "folder": "car-highway",
+    "first_image_desc": "Red and white cars drive side by side on a highway.",
+    "last_image_desc": "A black car overtakes between the red and white cars on the highway.",
+    "challenge": "Occlusion",
+    "caption": "A black car overtakes between two cars on the highway."
+  },
+  {
+    "folder": "hummingbird",
+    "first_image_desc": "Hummingbird hovers near pink flowers with blurred wings.",
+    "last_image_desc": "Hummingbird faces downward feeding from pink flowers.",
+    "challenge": "Dynamic motion",
+    "caption": "Hummingbird moves downward to feed from the pink flowers."
+  },
+  {
+    "folder": "duckling",
+    "first_image_desc": "A yellow duckling sits on the ground facing left.",
+    "last_image_desc": "A yellow duckling sits on the ground facing left.",
+    "challenge": "Near-static",
+    "caption": "A duckling rests on the ground facing left."
+  },
+  {
+    "folder": "man-bridge",
+    "first_image_desc": "A man runs toward the camera on a foggy bridge.",
+    "last_image_desc": "The man is closer to the camera on the same bridge.",
+    "challenge": "Dynamic motion",
+    "caption": "A man runs forward on a foggy bridge."
+  },
+  {
+    "folder": "skateboard",
+    "first_image_desc": "Person on skateboard with right arm raised in sunlight.",
+    "last_image_desc": "Person on skateboard with both arms extended outward.",
+    "challenge": "Dynamic motion",
+    "caption": "Person turns on skateboard with arms spreading outward."
+  },
+  {
+    "folder": "woman-exercise",
+    "first_image_desc": "Woman in pink workout clothes lifts right knee indoors.",
+    "last_image_desc": "Woman in pink workout clothes lifts left knee indoors.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman alternates knees during indoor exercise."
+  },
+  {
+    "folder": "walk-bench",
+    "first_image_desc": "A person walks on a path near a bench at sunrise.",
+    "last_image_desc": "The person is farther left on the path near the bench at sunrise.",
+    "challenge": "Linear motion",
+    "caption": "A person walks on a path near a bench."
+  },
+  {
+    "folder": "dog-frisbee",
+    "first_image_desc": "Two dogs run on wet sand chasing an orange frisbee.",
+    "last_image_desc": "One dog leaps and catches the orange frisbee above the other.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog jumps to catch frisbee over the waves."
+  },
+  {
+    "folder": "cyclist-road",
+    "first_image_desc": "A cyclist is entering from the left on a rural road.",
+    "last_image_desc": "The cyclist is further right and closer to the camera on the road.",
+    "challenge": "Dynamic motion",
+    "caption": "A cyclist moves rightward and closer along the road."
+  },
+  {
+    "folder": "dog-soccer",
+    "first_image_desc": "A black and white dog runs toward a soccer ball on sand.",
+    "last_image_desc": "The dog chases the soccer ball, kicking up sand with its paw.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog runs forward chasing a soccer ball on the sand."
+  },
+  {
+    "folder": "penguin",
+    "first_image_desc": "A penguin stands on a rock with head upright.",
+    "last_image_desc": "The penguin stands on a rock with head lowered toward chest.",
+    "challenge": "Dynamic motion",
+    "caption": "Penguin lowers its head toward its chest."
+  },
+  {
+    "folder": "man-lake",
+    "first_image_desc": "Man preparing to jump off a dock into a lake.",
+    "last_image_desc": "Man about to hit the water after jumping from the dock.",
+    "challenge": "Dynamic motion",
+    "caption": "Man jumps off the dock toward the lake."
+  },
+  {
+    "folder": "burger",
+    "first_image_desc": "Open sandwich bun with vegetables on a black tray.",
+    "last_image_desc": "Hand places a burger patty onto the sandwich bun.",
+    "challenge": "Occlusion",
+    "caption": "Hand lowers burger patty onto the sandwich bun."
+  },
+  {
+    "folder": "dog-pavement",
+    "first_image_desc": "A small dog runs toward the camera on a paved area.",
+    "last_image_desc": "The dog stands closer to the camera, facing left on the pavement.",
+    "challenge": "Dynamic motion",
+    "caption": "A dog runs forward and stops on the pavement."
+  },
+  {
+    "folder": "children-dance",
+    "first_image_desc": "A boy and girl stand facing each other holding hands outdoors.",
+    "last_image_desc": "The boy and girl cross their legs as if starting to dance.",
+    "challenge": "Dynamic motion",
+    "caption": "Two children begin dancing together outside a building."
+  },
+  {
+    "folder": "woman-rocky",
+    "first_image_desc": "Woman stands on rocky ground with left arm down and right leg extended.",
+    "last_image_desc": "Woman raises left arm outward while keeping right leg extended.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman swings left arm upward on rocky landscape."
+  },
+  {
+    "folder": "parrot",
+    "first_image_desc": "A red parrot faces slightly left with its beak open.",
+    "last_image_desc": "The red parrot faces forward with its beak closed.",
+    "challenge": "Linear motion",
+    "caption": "The parrot turns its head forward."
+  },
+  {
+    "folder": "wakeboarder",
+    "first_image_desc": "Person wakeboarding on water near white fence.",
+    "last_image_desc": "Person wakeboarding farther left with water spray behind.",
+    "challenge": "Dynamic motion",
+    "caption": "Wakeboarder moves quickly left across the water."
+  },
+  {
+    "folder": "dog-park",
+    "first_image_desc": "A small black and white dog faces away on grassy park lawn.",
+    "last_image_desc": "The dog faces forward on the grass with a person in the background.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog turns to face forward on the grass."
+  },
+  {
+    "folder": "woman-hand",
+    "first_image_desc": "Woman in black top raises right index finger under red and green light.",
+    "last_image_desc": "Woman in black top lifts both hands to her hair under colored light.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman lifts both hands to touch her hair."
+  },
+  {
+    "folder": "lion-yawn",
+    "first_image_desc": "A lioness yawns with mouth partially open beside another lion.",
+    "last_image_desc": "A lioness yawns with mouth wide open and tongue extended.",
+    "challenge": "Linear motion",
+    "caption": "A lioness opens her mouth wider during a yawn."
+  },
+  {
+    "folder": "cyclist-four",
+    "first_image_desc": "Three cyclists ride away on a tree-lined path.",
+    "last_image_desc": "Four cyclists ride away on a tree-lined path.",
+    "challenge": "Occlusion",
+    "caption": "A cyclist enters the path behind three other cyclists."
+  },
+  {
+    "folder": "husky",
+    "first_image_desc": "A husky stands on grass with mouth open facing left.",
+    "last_image_desc": "The husky sits down on the grass facing forward.",
+    "challenge": "Dynamic motion",
+    "caption": "A husky sits down on grassy field."
+  },
+  {
+    "folder": "smile-boy",
+    "first_image_desc": "Smiling boy in orange shirt rides bicycle outdoors.",
+    "last_image_desc": "Smiling boy in orange shirt rides bicycle further right.",
+    "challenge": "Dynamic motion",
+    "caption": "Smiling boy rides bicycle to the right."
+  },
+  {
+    "folder": "city",
+    "first_image_desc": "Blurry city skyline and coastline with ocean and palm tree.",
+    "last_image_desc": "Blurry city skyline and coastline with ocean and palm tree.",
+    "challenge": "Near-static",
+    "caption": "Blurry city skyline and coastline remain unchanged."
+  },
+  {
+    "folder": "silver-car",
+    "first_image_desc": "Front half of a silver car at a railroad crossing.",
+    "last_image_desc": "Entire silver car visible at a railroad crossing.",
+    "challenge": "Linear motion",
+    "caption": "Car moves forward across the railroad crossing."
+  },
+  {
+    "folder": "hand-water",
+    "first_image_desc": "Hands near a stream of running water without contact.",
+    "last_image_desc": "Hands directly under running water with visible splashes.",
+    "challenge": "Dynamic motion",
+    "caption": "Hands move under running water."
+  },
+  {
+    "folder": "salad",
+    "first_image_desc": "Hands hold two spoons above a bowl of fruit salad.",
+    "last_image_desc": "Hands lift fruit salad with two spoons above the bowl.",
+    "challenge": "Dynamic motion",
+    "caption": "Hands lift fruit salad with spoons from the bowl."
+  },
+  {
+    "folder": "aerobatics",
+    "first_image_desc": "Man in cockpit of glider flying over patchwork fields.",
+    "last_image_desc": "Man in cockpit of glider banking over fields and clouds.",
+    "challenge": "Large motion",
+    "caption": "Glider floats over fields with man holding control stick."
+  },
+  {
+    "folder": "air-conditioner",
+    "first_image_desc": "Hand holding remote showing 21°C in front of air conditioner.",
+    "last_image_desc": "Hand holding remote showing 22°C in front of air conditioner.",
+    "challenge": "Near-static",
+    "caption": "Remote temperature increases from 21 to 22 degrees Celsius."
+  },
+  {
+    "folder": "baby-duck",
+    "first_image_desc": "Duckling swimming on water facing left.",
+    "last_image_desc": "Duckling reaches water surface with its beak lowered.",
+    "challenge": "Linear motion",
+    "caption": "Duckling swims left and lowers beak to water."
+  },
+  {
+    "folder": "beach-ball",
+    "first_image_desc": "Man with ball and dog near shoreline, woman stands on sand.",
+    "last_image_desc": "Ball moves toward woman, man and dog remain near water.",
+    "challenge": "Large motion",
+    "caption": "Man throws red ball toward woman on the beach."
+  },
+  {
+    "folder": "beach-metal",
+    "first_image_desc": "Person with metal detector walking on sandy beach facing ocean.",
+    "last_image_desc": "Person with metal detector farther along beach facing ocean.",
+    "challenge": "Linear motion",
+    "caption": "Person walks forward on the beach with a metal detector."
+  },
+  {
+    "folder": "bear",
+    "first_image_desc": "A brown bear walks left among rocks and dirt.",
+    "last_image_desc": "The brown bear is closer to the large rock on the left.",
+    "challenge": "Linear motion",
+    "caption": "The bear walks left toward the large rock."
+  },
+  {
+    "folder": "bench-swing",
+    "first_image_desc": "Empty wooden swing hangs between two posts near flowers and a pond.",
+    "last_image_desc": "Empty wooden swing has moved rightward between two posts near flowers and pond.",
+    "challenge": "Linear motion",
+    "caption": "Swing moves rightward between two wooden posts."
+  },
+  {
+    "folder": "bike-packing",
+    "first_image_desc": "Man in cycling gear bends over bicycle.",
+    "last_image_desc": "Man lifts bicycle with both wheels.",
+    "challenge": "Large motion",
+    "caption": "The man examines the bicycle and then lifts it toward the open bike case."
+  },
+  {
+    "folder": "bird",
+    "first_image_desc": "White cockatoo perched on a branch with wings raised.",
+    "last_image_desc": "White cockatoo perched on a branch with wings still raised.",
+    "challenge": "Large motion",
+    "caption": "The white cockatoo keeps sitting on the branch and then getting up again."
+  },
+  {
+    "folder": "bird-tail",
+    "first_image_desc": "A small brown bird stands on mossy wood with wings raised.",
+    "last_image_desc": "The bird faces forward on the mossy wood with wings spread wide.",
+    "challenge": "Large motion",
+    "caption": "Bird is dancing, flapping its wings and shaking its tail feathers."
+  },
+  {
+    "folder": "blackswan",
+    "first_image_desc": "A black swan swims in water near a concrete edge and greenery.",
+    "last_image_desc": "The black swan has turned its head further to the right while swimming.",
+    "challenge": "Linear motion",
+    "caption": "A black swan is swimming forward."
+  },
+  {
+    "folder": "bmx-bumps",
+    "first_image_desc": "A person in motocross gear rides a bicycle on dirt track.",
+    "last_image_desc": "The person on the bicycle is airborne over a dirt ramp.",
+    "challenge": "Large motion",
+    "caption": "A BMX rider jumps over a dirt ramp."
+  },
+  {
+    "folder": "bmx-trees",
+    "first_image_desc": "A boy rides a bicycle past a colorful mural.",
+    "last_image_desc": "The boy on the bicycle moves further right past trees and mural.",
+    "challenge": "Linear motion",
+    "caption": "A boy rides his bicycle forward, passing trees and murals."
+  },
+  {
+    "folder": "boat",
+    "first_image_desc": "A white fishing boat moves left on calm blue water near shore.",
+    "last_image_desc": "The fishing boat has moved further left on the water near the shore.",
+    "challenge": "Near-static",
+    "caption": "A fishing boat slowly moves leftward across the water."
+  },
+  {
+    "folder": "book",
+    "first_image_desc": "An open book lies on sand with pages still.",
+    "last_image_desc": "An open book lies on sand with pages flipping upward.",
+    "challenge": "Large motion",
+    "caption": "Book pages flip upward in the wind."
+  },
+  {
+    "folder": "bowl",
+    "first_image_desc": "Hand holds mallet above brass singing bowl in snowy forest.",
+    "last_image_desc": "Mallet with red tip is lowered inside brass singing bowl.",
+    "challenge": "Linear motion",
+    "caption": "The mallet sweeps counterclockwise around the brass singing bowl."
+  },
+  {
+    "folder": "boxing-fisheye",
+    "first_image_desc": "Two boxers with headgear face each other in a ring outdoors.",
+    "last_image_desc": "Boxer in blue headgear throws a punch at boxer in red headgear.",
+    "challenge": "Large motion",
+    "caption": "Boxers are punching toward each other."
+  },
+  {
+    "folder": "boy-bike",
+    "first_image_desc": "A boy rides a bicycle on a rural paved road.",
+    "last_image_desc": "The boy on the bicycle is closer on the same road.",
+    "challenge": "Linear motion",
+    "caption": "A boy rides a bicycle forward along the road."
+  },
+  {
+    "folder": "breakdance",
+    "first_image_desc": "Breakdancer balances on one hand with legs extended upward.",
+    "last_image_desc": "Breakdancer rolls on the ground with legs raised and bent.",
+    "challenge": "Large motion",
+    "caption": "Breakdancer spins from handstand to rolling on the ground."
+  },
+  {
+    "folder": "breakdance-flare",
+    "first_image_desc": "Person balances on one hand with one leg raised high.",
+    "last_image_desc": "Person balances on one hand with both legs extended outward.",
+    "challenge": "Large motion",
+    "caption": "Person spins on one hand with legs sweeping outward."
+  },
+  {
+    "folder": "brown-sheep",
+    "first_image_desc": "A brown goat stands on grass facing left with head raised.",
+    "last_image_desc": "The brown goat stands on grass facing left with head lowered.",
+    "challenge": "Large motion",
+    "caption": "Goat lowers its head toward the ground."
+  },
+  {
+    "folder": "bus",
+    "first_image_desc": "A city bus is driving on a street near a bus stop.",
+    "last_image_desc": "The city bus has moved forward and is closer to a yield sign.",
+    "challenge": "Linear motion",
+    "caption": "A city bus moves forward along the street."
+  },
+  {
+    "folder": "camel",
+    "first_image_desc": "A camel stands near a wooden fence facing right.",
+    "last_image_desc": "The camel stands closer to the fence with its head near the boards.",
+    "challenge": "Linear motion",
+    "caption": "Camel walks toward the wooden fence on the right."
+  },
+  {
+    "folder": "camel-white",
+    "first_image_desc": "A white camel stands on grass facing right.",
+    "last_image_desc": "The white camel steps forward with its left legs lifted.",
+    "challenge": "Near-static",
+    "caption": "The camel slowly walks forward on the grass."
+  },
+  {
+    "folder": "car-race",
+    "first_image_desc": "Driver steering a truck near a red vehicle on a wet racetrack.",
+    "last_image_desc": "Driver steering truck as red vehicle moves out of view on racetrack.",
+    "challenge": "Large motion",
+    "caption": "Red vehicle moves right as truck turns left on racetrack."
+  },
+  {
+    "folder": "car-roundabout",
+    "first_image_desc": "A gray car turns right at a roundabout in a city.",
+    "last_image_desc": "The gray car drives straight past a roundabout monument.",
+    "challenge": "Linear motion",
+    "caption": "A gray car is circling the roundabout."
+  },
+  {
+    "folder": "car-shadow",
+    "first_image_desc": "A silver car turning left at an intersection.",
+    "last_image_desc": "The silver car has moved further left across the intersection.",
+    "challenge": "Linear motion",
+    "caption": "A silver car is moving forward."
+  },
+  {
+    "folder": "car-turn",
+    "first_image_desc": "A silver SUV is on a mountain road near a curve.",
+    "last_image_desc": "The silver SUV has moved further along the curved mountain road.",
+    "challenge": "Linear motion",
+    "caption": "SUV drives forward along the winding mountain road."
+  },
+  {
+    "folder": "carousel",
+    "first_image_desc": "Colorful horse swings hang empty in a playground.",
+    "last_image_desc": "Horse swings have shifted positions around the central pole.",
+    "challenge": "Large motion",
+    "caption": "Horse swings rotate counterclockwise around the blue pole."
+  },
+  {
+    "folder": "cat-girl",
+    "first_image_desc": "Girl holding a kitten close to her face, kitten's paw on her mouth.",
+    "last_image_desc": "Girl lifts kitten up with both hands, kitten facing forward.",
+    "challenge": "Large motion",
+    "caption": "Girl lifts kitten upward in front of her."
+  },
+  {
+    "folder": "cats-car",
+    "first_image_desc": "Two children holding kittens near a pink toy car outdoors.",
+    "last_image_desc": "One child lifts an orange kitten higher near the pink toy car.",
+    "challenge": "Large motion",
+    "caption": "Two children are laughing as they lift the cats."
+  },
+  {
+    "folder": "chamaleon",
+    "first_image_desc": "A green lizard stretches across branches with legs extended backward.",
+    "last_image_desc": "The green lizard raises both legs upward while gripping branches.",
+    "challenge": "Large motion",
+    "caption": "The lizard lifts its legs while climbing on branches."
+  },
+  {
+    "folder": "classic-car",
+    "first_image_desc": "A vintage black race car drives past a crowd outdoors.",
+    "last_image_desc": "The vintage race car is much closer with more details visible.",
+    "challenge": "Linear motion",
+    "caption": "Vintage race car moves left past a crowd of spectators."
+  },
+  {
+    "folder": "color-run",
+    "first_image_desc": "Hands with green powder approach people at a color run event.",
+    "last_image_desc": "Hand with green powder blocks most of the view at color run.",
+    "challenge": "Occlusion",
+    "caption": "Hand with green powder moves closer to the color run participants."
+  },
+  {
+    "folder": "cook",
+    "first_image_desc": "A person holds a knife above an apple pie.",
+    "last_image_desc": "The knife is closer to the apple pie, about to cut.",
+    "challenge": "Near-static",
+    "caption": "A knife moves toward the apple pie."
+  },
+  {
+    "folder": "cows",
+    "first_image_desc": "A brown and white cow walks left on a dirt path.",
+    "last_image_desc": "The cow has moved further left along the same dirt path.",
+    "challenge": "Linear motion",
+    "caption": "A cow walks right along a dirt path."
+  },
+  {
+    "folder": "crossing",
+    "first_image_desc": "Two people walk on a crosswalk near a white truck.",
+    "last_image_desc": "Two people walk further along the crosswalk past the white truck.",
+    "challenge": "Linear motion",
+    "caption": "Two people walk across the crosswalk from right to left."
+  },
+  {
+    "folder": "dance-jump",
+    "first_image_desc": "Girl in white and pink dress spins near fountain with statues.",
+    "last_image_desc": "Girl in white and pink dress faces fountain after spinning.",
+    "challenge": "Large motion",
+    "caption": "Girl in a pink dress is jumping and spinning near the stone fountain."
+  },
+  {
+    "folder": "dance-twirl",
+    "first_image_desc": "Dancer in blue dress steps forward with arm raised outdoors.",
+    "last_image_desc": "Dancer in blue dress runs left with arms extended outdoors.",
+    "challenge": "Large motion",
+    "caption": "Dancer steps to the left while dancing."
+  },
+  {
+    "folder": "dancing",
+    "first_image_desc": "Two people begin dancing in the center of a street circle.",
+    "last_image_desc": "The two dancers move closer together in the center of the circle.",
+    "challenge": "Large motion",
+    "caption": "Two people dance energetically in the center of a street circle."
+  },
+  {
+    "folder": "deer",
+    "first_image_desc": "Two deer face each other on snowy ground under trees.",
+    "last_image_desc": "Two deer partially hidden by tree branches on snowy ground.",
+    "challenge": "Large motion",
+    "caption": "Two deer butt heads."
+  },
+  {
+    "folder": "desert-camel",
+    "first_image_desc": "Two men and two camels walking right on a sand dune at sunset.",
+    "last_image_desc": "Two men and two camels further right on a sand dune at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Two men lead camels across the desert at sunset."
+  },
+  {
+    "folder": "disc-jockey",
+    "first_image_desc": "Man with tattoos stands beside hooded person in white mask.",
+    "last_image_desc": "Tattooed man turns right with blurred arms beside masked person.",
+    "challenge": "Large motion",
+    "caption": "Tattooed man turns and raises arms beside masked person."
+  },
+  {
+    "folder": "dog",
+    "first_image_desc": "Golden retriever with harness walking left on dry grass.",
+    "last_image_desc": "Golden retriever with harness walking forward on dry grass.",
+    "challenge": "Large motion",
+    "caption": "Dog walks forward across the dry grass."
+  },
+  {
+    "folder": "dog-agility",
+    "first_image_desc": "A blurry dog weaves between red and white poles on grass.",
+    "last_image_desc": "The dog is almost out of frame on the left, still weaving.",
+    "challenge": "Large motion",
+    "caption": "A dog weaves quickly through agility poles leftward."
+  },
+  {
+    "folder": "dog-bark",
+    "first_image_desc": "A Doberman with mouth closed on a leash indoors.",
+    "last_image_desc": "The Doberman has its mouth wide open showing teeth.",
+    "challenge": "Large motion",
+    "caption": "Doberman opens mouth wide and bares teeth."
+  },
+  {
+    "folder": "dog-beach",
+    "first_image_desc": "A black and brown dog starts running on a sandy beach.",
+    "last_image_desc": "The same dog is running further along the beach.",
+    "challenge": "Large motion",
+    "caption": "A dog runs quickly across the sandy beach."
+  },
+  {
+    "folder": "dog-gooses",
+    "first_image_desc": "A black and white dog crouches facing five ducks on grass.",
+    "last_image_desc": "The dog and five ducks are farther apart on the grassy field.",
+    "challenge": "Large motion",
+    "caption": "The ducks move right away from the crouching dog."
+  },
+  {
+    "folder": "dog-snow",
+    "first_image_desc": "Brown dog in snow looking forward with head tilted left.",
+    "last_image_desc": "Brown dog in snow looking left with head turned further.",
+    "challenge": "Near-static",
+    "caption": "Dog turns its head left in falling snow."
+  },
+  {
+    "folder": "dog-swim",
+    "first_image_desc": "A golden retriever splashes in shallow water facing left.",
+    "last_image_desc": "A golden retriever splashes in shallow water facing forward.",
+    "challenge": "Large motion",
+    "caption": "Golden retriever runs through shallow water toward the viewer."
+  },
+  {
+    "folder": "dog-water",
+    "first_image_desc": "A black and white dog lies behind a white bowl.",
+    "last_image_desc": "The dog stands close to the bowl with one paw raised.",
+    "challenge": "Large motion",
+    "caption": "Dog approaches the bowl from the background."
+  },
+  {
+    "folder": "dogs-jump",
+    "first_image_desc": "Woman in yellow stands with two dogs on grass under cloudy sky.",
+    "last_image_desc": "Woman in yellow stands as one dog jumps and another walks away.",
+    "challenge": "Large motion",
+    "caption": "Dog jumps while another dog jumps and walks away on the grass."
+  },
+  {
+    "folder": "dogs-scale",
+    "first_image_desc": "A hand holds a puppy near a pink kitchen scale on a table.",
+    "last_image_desc": "A hand places the puppy onto the scale above the table.",
+    "challenge": "Large motion",
+    "caption": "A puppy is lifted onto a pink kitchen scale."
+  },
+  {
+    "folder": "drift-chicane",
+    "first_image_desc": "A red drift car enters a turn on a racetrack with smoke.",
+    "last_image_desc": "The red drift car slides further along the turn producing more smoke.",
+    "challenge": "Large motion",
+    "caption": "A drift car slides rightward around a racetrack corner."
+  },
+  {
+    "folder": "drift-straight",
+    "first_image_desc": "A red race car is approaching a curve on a racetrack.",
+    "last_image_desc": "The red race car is much closer and near the right edge.",
+    "challenge": "Large motion",
+    "caption": "A red race car drifts quickly toward the viewer."
+  },
+  {
+    "folder": "drift-turn",
+    "first_image_desc": "A race car drifts around a corner with smoke behind it.",
+    "last_image_desc": "The race car is closer, drifting with more smoke and visible sponsors.",
+    "challenge": "Large motion",
+    "caption": "A race car drifts right around a track corner."
+  },
+  {
+    "folder": "drone",
+    "first_image_desc": "Man holding phone near display shelf with another man standing nearby.",
+    "last_image_desc": "Man's legs and small drone visible on blue floor near shelf.",
+    "challenge": "Large motion",
+    "caption": "Man crouches down and drone appears on the floor."
+  },
+  {
+    "folder": "drum",
+    "first_image_desc": "Man in tank top and headphones playing drums with right hand down.",
+    "last_image_desc": "Man in tank top and headphones playing drums with right hand raised.",
+    "challenge": "Large motion",
+    "caption": "Drummer is passionately playing the drums."
+  },
+  {
+    "folder": "elephant",
+    "first_image_desc": "An elephant stands near rocks and trees in a dusty enclosure.",
+    "last_image_desc": "The elephant has walked further right in the dusty enclosure.",
+    "challenge": "Linear motion",
+    "caption": "An elephant walks right through a dusty enclosure."
+  },
+  {
+    "folder": "flamingo",
+    "first_image_desc": "A flamingo stands in shallow water with its head raised.",
+    "last_image_desc": "The flamingo lowers its head to touch the water surface.",
+    "challenge": "Large motion",
+    "caption": "A flamingo lowers its head toward the water."
+  },
+  {
+    "folder": "four-walking",
+    "first_image_desc": "Five people in white outfits walking on a cobblestone street.",
+    "last_image_desc": "Five people in white outfits closer on the cobblestone street.",
+    "challenge": "Large motion",
+    "caption": "Five people walk forward on a cobblestone street."
+  },
+  {
+    "folder": "frog",
+    "first_image_desc": "A green frog sits on rocky ground facing left.",
+    "last_image_desc": "The same green frog sits on rocky ground facing left.",
+    "challenge": "Near-static",
+    "caption": "A green frog remains still on the rocky ground."
+  },
+  {
+    "folder": "gazelle",
+    "first_image_desc": "A gazelle with horns lying on sandy ground mouth slightly open.",
+    "last_image_desc": "The same gazelle in the same position with mouth closed.",
+    "challenge": "Near-static",
+    "caption": "Gazelle closes its mouth while resting on the ground."
+  },
+  {
+    "folder": "giant-slalom",
+    "first_image_desc": "A skier in red suit and blue helmet skiing downhill past flags.",
+    "last_image_desc": "The skier is no longer visible on the snowy slope with flags.",
+    "challenge": "Occlusion",
+    "caption": "A skier disappears behind a snowy hill on the course."
+  },
+  {
+    "folder": "girl-dog",
+    "first_image_desc": "Person in wheelchair and dog moving on sidewalk near grass.",
+    "last_image_desc": "Person in wheelchair and dog have moved forward along the sidewalk.",
+    "challenge": "Large motion",
+    "caption": "Person in wheelchair and dog move forward on the sidewalk."
+  },
+  {
+    "folder": "girl-happy",
+    "first_image_desc": "Woman in white shirt smiling with arms outstretched looking right.",
+    "last_image_desc": "Woman in white shirt smiling with arms outstretched looking left.",
+    "challenge": "Large motion",
+    "caption": "Woman turns her head from right to left while smiling."
+  },
+  {
+    "folder": "girl-music",
+    "first_image_desc": "Person with closed eyes holding headphones upright against ears.",
+    "last_image_desc": "Person with closed eyes tilting head left holding headphones.",
+    "challenge": "Near-static",
+    "caption": "The girl is swaying her head slightly from side to side as she feels the music."
+  },
+  {
+    "folder": "girl-smile",
+    "first_image_desc": "Girl in black jacket touches hair with both hands near head.",
+    "last_image_desc": "Girl in black jacket holds hair behind ears with both hands.",
+    "challenge": "Large motion",
+    "caption": "Girl moves hands to tuck hair behind ears."
+  },
+  {
+    "folder": "girl-turn",
+    "first_image_desc": "Girl in yellow dress stands facing forward with arms out.",
+    "last_image_desc": "Girl in yellow dress turns slightly to her left with eyes closed.",
+    "challenge": "Large motion",
+    "caption": "Girl in yellow dress turns left and closes her eyes."
+  },
+  {
+    "folder": "goat",
+    "first_image_desc": "A goat stands on rocky terrain facing away.",
+    "last_image_desc": "The goat stands further right on the rocky slope.",
+    "challenge": "Large motion",
+    "caption": "Goat walks rightward across rocky hillside."
+  },
+  {
+    "folder": "goat-branch",
+    "first_image_desc": "A brown goat stands under a horizontal branch in sunlight.",
+    "last_image_desc": "The brown goat remains under the branch in the same position.",
+    "challenge": "Near-static",
+    "caption": "A goat stands under a fallen tree branch."
+  },
+  {
+    "folder": "gold-fish",
+    "first_image_desc": "Five goldfish swimming in a blue-lit aquarium near plants and rocks.",
+    "last_image_desc": "Five goldfish swimming in similar positions in the blue-lit aquarium.",
+    "challenge": "Near-static",
+    "caption": "Goldfish swim slowly in a blue-lit aquarium."
+  },
+  {
+    "folder": "golf",
+    "first_image_desc": "Man walking toward a white golf cart on grassy field.",
+    "last_image_desc": "Man leaning into the white golf cart on grassy field.",
+    "challenge": "Large motion",
+    "caption": "Man walks to golf cart and gets inside."
+  },
+  {
+    "folder": "gorilla",
+    "first_image_desc": "Adult and young gorilla visible among green leaves.",
+    "last_image_desc": "Young gorilla mostly hidden behind leaves near adult gorilla.",
+    "challenge": "Occlusion",
+    "caption": "Leaves gradually hide the young gorilla beside the adult."
+  },
+  {
+    "folder": "guitar-violin",
+    "first_image_desc": "Man in suit plays violin near man playing guitar in warm room.",
+    "last_image_desc": "Violinist's hand moves further right while guitarist looks up slightly.",
+    "challenge": "Large motion",
+    "caption": "Violinist is playing the violin."
+  },
+  {
+    "folder": "gym",
+    "first_image_desc": "Two women in gym attire standing near weights and bottles.",
+    "last_image_desc": "Both women squat and reach for bottles near a gym pillar.",
+    "challenge": "Occlusion",
+    "caption": "Both women squat and reach for bottles near the pillar."
+  },
+  {
+    "folder": "gym-pull",
+    "first_image_desc": "Man seated pulling cable machine bar overhead with arms extended.",
+    "last_image_desc": "Man seated pulling cable machine bar down to chest level.",
+    "challenge": "Large motion",
+    "caption": "Man pulls lat pulldown bar from overhead to chest."
+  },
+  {
+    "folder": "gym-wave",
+    "first_image_desc": "Man in white shirt swings battle ropes upward in gym.",
+    "last_image_desc": "Man in white shirt swings battle ropes downward in gym.",
+    "challenge": "Large motion",
+    "caption": "Man swings battle ropes up and down during workout."
+  },
+  {
+    "folder": "helicopter",
+    "first_image_desc": "Person in yellow vest stands on tarmac near hovering helicopter.",
+    "last_image_desc": "Person walks forward on tarmac as helicopter hovers ahead.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward, watching hovering helicopter on the tarmac."
+  },
+  {
+    "folder": "hike",
+    "first_image_desc": "Man with backpack walking on rocky mountain trail.",
+    "last_image_desc": "Man with backpack lifting right leg on rocky mountain trail.",
+    "challenge": "Linear motion",
+    "caption": "Man hikes forward on rocky mountain path."
+  },
+  {
+    "folder": "hike-man",
+    "first_image_desc": "Person with backpack walking on a sunlit forest path.",
+    "last_image_desc": "Person with backpack farther along the same forest path.",
+    "challenge": "Linear motion",
+    "caption": "A person walks forward along a forest path."
+  },
+  {
+    "folder": "hockey",
+    "first_image_desc": "Man on rollerblades with hockey stick near small net, ball farther left.",
+    "last_image_desc": "Man on rollerblades with hockey stick, ball has rolled farther left.",
+    "challenge": "Large motion",
+    "caption": "Ball rolls left across the rink."
+  },
+  {
+    "folder": "horsejump-high",
+    "first_image_desc": "Horse and rider approach a jump in an outdoor arena.",
+    "last_image_desc": "Horse and rider land after clearing the jump.",
+    "challenge": "Large motion",
+    "caption": "Horse and rider leap over the obstacle from left to right."
+  },
+  {
+    "folder": "horsejump-low",
+    "first_image_desc": "A rider on a white horse approaches a jump in an arena.",
+    "last_image_desc": "The horse and rider are jumping over a blue and white obstacle.",
+    "challenge": "Large motion",
+    "caption": "Horse and rider jump over a blue and white obstacle."
+  },
+  {
+    "folder": "horsejump-stick",
+    "first_image_desc": "Rider on a brown and white horse approaching a jump outdoors.",
+    "last_image_desc": "Rider on the same horse directly in front of a red and white jump.",
+    "challenge": "Occlusion",
+    "caption": "Horse and rider move toward the jump."
+  },
+  {
+    "folder": "hoverboard",
+    "first_image_desc": "Person on a hoverboard facing forward on a wet path.",
+    "last_image_desc": "Person on a hoverboard near the left edge, partially out of view.",
+    "challenge": "Linear motion",
+    "caption": "Person rides a hoverboard to the left along the path."
+  },
+  {
+    "folder": "india",
+    "first_image_desc": "Many people walk and ride scooters on a sunlit street.",
+    "last_image_desc": "A person on a scooter moves across the right side of the street.",
+    "challenge": "Occlusion",
+    "caption": "A scooter passes in front of people walking on the street."
+  },
+  {
+    "folder": "judo",
+    "first_image_desc": "Two people in white gis grapple on a dojo mat.",
+    "last_image_desc": "One person throws the other who is upside down in midair.",
+    "challenge": "Large motion",
+    "caption": "A judo practitioner throws an opponent over his shoulder."
+  },
+  {
+    "folder": "kid-football",
+    "first_image_desc": "Boy in orange jersey and cap faces soccer ball in air.",
+    "last_image_desc": "Boy in orange jersey holds soccer ball under left arm.",
+    "challenge": "Large motion",
+    "caption": "Boy is performing a soccer ball kick-up."
+  },
+  {
+    "folder": "kite-surf",
+    "first_image_desc": "Person kiteboarding on turquoise water with splashing waves.",
+    "last_image_desc": "Person kiteboarding further right with water splashing behind.",
+    "challenge": "Large motion",
+    "caption": "Kiteboarder moves quickly right across the water."
+  },
+  {
+    "folder": "kite-walk",
+    "first_image_desc": "Person in helmet and life vest stands on sandy beach with kiteboard.",
+    "last_image_desc": "Person in helmet and life vest walks on sandy beach with kiteboard.",
+    "challenge": "Large motion",
+    "caption": "Kiteboarder walks backward along the sandy beach."
+  },
+  {
+    "folder": "koala",
+    "first_image_desc": "A koala climbs on a tree branch facing right.",
+    "last_image_desc": "The koala's head is out of view behind the tree branch.",
+    "challenge": "Occlusion",
+    "caption": "Koala climbs right and head disappears behind tree branch."
+  },
+  {
+    "folder": "lab-coat",
+    "first_image_desc": "Three girls in lab coats stand on grass facing left.",
+    "last_image_desc": "Three girls in lab coats stand on grass closer to the camera.",
+    "challenge": "Large motion",
+    "caption": "The camera gradually zooms in on the three girls in lab coats."
+  },
+  {
+    "folder": "lady-running",
+    "first_image_desc": "Elderly woman in colorful shirt walking away in a dining area.",
+    "last_image_desc": "Elderly woman has moved further into the dining area with more people visible.",
+    "challenge": "Large motion",
+    "caption": "Elderly woman runs forward through the dining area."
+  },
+  {
+    "folder": "libby",
+    "first_image_desc": "A dog runs left past a tree and fence in a garden.",
+    "last_image_desc": "The dog runs right near a tree and garden fence.",
+    "challenge": "Large motion",
+    "caption": "A dog runs quickly along a fenced garden path."
+  },
+  {
+    "folder": "lindy-hop",
+    "first_image_desc": "Several couples dance in a brightly lit hall with wooden floors.",
+    "last_image_desc": "The same couples continue dancing in the hall, changing positions and poses.",
+    "challenge": "Large motion",
+    "caption": "Couples are dancing in pairs, moving around in a circle."
+  },
+  {
+    "folder": "loading",
+    "first_image_desc": "Man holds a Samsung TV box near a store shelf.",
+    "last_image_desc": "Man places the Samsung TV box onto a cart with other TVs.",
+    "challenge": "Large motion",
+    "caption": "Man moves Samsung TV box from shelf to cart."
+  },
+  {
+    "folder": "lock",
+    "first_image_desc": "Hand holding a keyring inserts a key into a brass padlock.",
+    "last_image_desc": "Hand turns the key in the brass padlock on a blue door.",
+    "challenge": "Large motion",
+    "caption": "Key turns in the brass padlock on the blue door."
+  },
+  {
+    "folder": "longboard",
+    "first_image_desc": "Person in yellow shirt skateboards away from camera on forest path.",
+    "last_image_desc": "Person in yellow shirt skateboards further ahead, cyclist approaches closer.",
+    "challenge": "Large motion",
+    "caption": "Skateboarder moves forward as cyclist approaches on the path."
+  },
+  {
+    "folder": "lucia",
+    "first_image_desc": "Woman in black dress walks left on path near grass and trees.",
+    "last_image_desc": "Woman in black dress walks further left approaching a wooden bench.",
+    "challenge": "Large motion",
+    "caption": "Woman walks right toward a bench on a sunny path."
+  },
+  {
+    "folder": "makeup",
+    "first_image_desc": "A hand applies makeup to a woman's closed eyelid.",
+    "last_image_desc": "The woman looks ahead with her eyes open and makeup applied.",
+    "challenge": "Occlusion",
+    "caption": "A woman opens her eyes after makeup is applied."
+  },
+  {
+    "folder": "mallard-fly",
+    "first_image_desc": "A duck stands on green grass near a flowing river.",
+    "last_image_desc": "A duck walks on grass closer to the riverbank.",
+    "challenge": "Large motion",
+    "caption": "A duck turns around and dashes forward."
+  },
+  {
+    "folder": "mallard-water",
+    "first_image_desc": "A brown duck swims on rippling water facing right.",
+    "last_image_desc": "The brown duck is slightly farther left still swimming on water.",
+    "challenge": "Large motion",
+    "caption": "A duck swims rightward across the pond."
+  },
+  {
+    "folder": "man",
+    "first_image_desc": "Man in blue shirt tilts head slightly left.",
+    "last_image_desc": "Man in blue shirt tilts head slightly right.",
+    "challenge": "Near-static",
+    "caption": "Man is staring at the camera."
+  },
+  {
+    "folder": "man-bike",
+    "first_image_desc": "Man riding motorcycle with arms outstretched in sunlight.",
+    "last_image_desc": "Man on motorcycle slightly farther right with arms outstretched in sunlight.",
+    "challenge": "Linear motion",
+    "caption": "Man rides motorcycle right with arms outstretched."
+  },
+  {
+    "folder": "man-eat",
+    "first_image_desc": "Man in glasses about to eat food with a spoon.",
+    "last_image_desc": "Man in glasses finishing eating with a spoon near his mouth.",
+    "challenge": "Large motion",
+    "caption": "Man lifts food to his mouth with a spoon."
+  },
+  {
+    "folder": "mbike-trick",
+    "first_image_desc": "Motorcyclist facing forward with light smoke behind rear tire.",
+    "last_image_desc": "Motorcyclist facing forward with thick smoke billowing from rear tire.",
+    "challenge": "Occlusion",
+    "caption": "Smoke from motorcycle burnout grows and spreads outward."
+  },
+  {
+    "folder": "miami-surf",
+    "first_image_desc": "Several surfers ride a wave in the ocean.",
+    "last_image_desc": "One surfer stands on a wave while another falls off their board.",
+    "challenge": "Occlusion",
+    "caption": "A surfer falls off the board as another rides the wave."
+  },
+  {
+    "folder": "monkeys-trees",
+    "first_image_desc": "A monkey climbs a curved branch near a wooden structure.",
+    "last_image_desc": "The monkey is higher on the branch approaching the wooden structure.",
+    "challenge": "Large motion",
+    "caption": "The monkey climbs upward along the curved branch."
+  },
+  {
+    "folder": "motocross-bumps",
+    "first_image_desc": "A motocross rider approaches a dirt jump on a track.",
+    "last_image_desc": "The motocross rider is airborne above the dirt jump.",
+    "challenge": "Large motion",
+    "caption": "A motocross rider jumps over a dirt ramp."
+  },
+  {
+    "folder": "motocross-jump",
+    "first_image_desc": "A motocross rider approaches a dirt jump in a forest area.",
+    "last_image_desc": "The motocross rider is airborne close to the camera above the jump.",
+    "challenge": "Large motion",
+    "caption": "Motocross rider jumps high over the dirt ramp."
+  },
+  {
+    "folder": "motorbike",
+    "first_image_desc": "Two people ride a motorcycle on a road near mountains.",
+    "last_image_desc": "Motorcycle with two riders is partially hidden behind a large flower pot.",
+    "challenge": "Occlusion",
+    "caption": "Motorcycle with two riders passes behind a large flower pot."
+  },
+  {
+    "folder": "mtb-race",
+    "first_image_desc": "Cyclist follows another rider on a forest trail.",
+    "last_image_desc": "Cyclist is closer to the rider ahead on the forest trail.",
+    "challenge": "Large motion",
+    "caption": "Cyclist moves forward and get closer to another rider on a forest trail."
+  },
+  {
+    "folder": "night-race",
+    "first_image_desc": "Two sports cars drive inside a covered racetrack.",
+    "last_image_desc": "Two sports cars have moved forward inside the covered racetrack.",
+    "challenge": "Large motion",
+    "caption": "Two sports cars race forward inside the covered racetrack."
+  },
+  {
+    "folder": "orchid",
+    "first_image_desc": "Person holding a large piece of bark with orchid leaves in front.",
+    "last_image_desc": "Person rotates bark so orchid leaves face more to the left.",
+    "challenge": "Occlusion",
+    "caption": "Person rotates orchid mounted on bark to the right."
+  },
+  {
+    "folder": "paragliding",
+    "first_image_desc": "A paraglider flies above a green valley and village buildings.",
+    "last_image_desc": "The paraglider has moved leftward above the same valley and village.",
+    "challenge": "Large motion",
+    "caption": "A paraglider moves leftward above a village and green valley."
+  },
+  {
+    "folder": "paragliding-launch",
+    "first_image_desc": "Person in paragliding gear stands on grassy hilltop.",
+    "last_image_desc": "Person in paragliding gear runs forward down grassy slope.",
+    "challenge": "Large motion",
+    "caption": "Paraglider runs forward down the grassy hill."
+  },
+  {
+    "folder": "paragliding-sky",
+    "first_image_desc": "A paraglider is high in the sky above mountains and sea.",
+    "last_image_desc": "The paraglider has moved leftward in the sky above mountains and sea.",
+    "challenge": "Near-static",
+    "caption": "A paraglider moves leftward through the sky over mountains."
+  },
+  {
+    "folder": "parkour",
+    "first_image_desc": "Man jumping over a metal fence in an outdoor urban area.",
+    "last_image_desc": "Man landing on pavement after clearing a stone wall.",
+    "challenge": "Large motion",
+    "caption": "A man is running over fences and walls."
+  },
+  {
+    "folder": "people-sunset",
+    "first_image_desc": "Two people walk down a sandy path toward the ocean at sunset.",
+    "last_image_desc": "One person continues down the path as the other crouches near the ground.",
+    "challenge": "Large motion",
+    "caption": "People are walking toward the sea at sunset."
+  },
+  {
+    "folder": "pigs",
+    "first_image_desc": "Three pigs standing on dirt with heads down.",
+    "last_image_desc": "Three pigs standing on dirt with heads down.",
+    "challenge": "Near-static",
+    "caption": "Three pigs stand close together on the dirt."
+  },
+  {
+    "folder": "planes-crossing",
+    "first_image_desc": "Large China Southern airplane taxiing on runway under blue sky.",
+    "last_image_desc": "Small KLM airplane on runway with Schiphol logo and clear sky.",
+    "challenge": "Large motion",
+    "caption": "Large airplane exits and smaller airplane enters the runway."
+  },
+  {
+    "folder": "planes-water",
+    "first_image_desc": "Large airplane facing forward on wet runway at dusk.",
+    "last_image_desc": "Large airplane slightly farther down wet runway at dusk.",
+    "challenge": "Near-static",
+    "caption": "Airplane slowly taxis forward on wet runway."
+  },
+  {
+    "folder": "rabbit-cute",
+    "first_image_desc": "A white and gray rabbit sits in green grass near a fence.",
+    "last_image_desc": "The same rabbit remains in the grass in the same position.",
+    "challenge": "Near-static",
+    "caption": "Rabbit sits still in the grass."
+  },
+  {
+    "folder": "rallye",
+    "first_image_desc": "A rally car approaches on a dirt road with spectators in the distance.",
+    "last_image_desc": "The rally car is much closer on the dirt road with dust behind it.",
+    "challenge": "Large motion",
+    "caption": "A rally car speeds forward on a dirt road."
+  },
+  {
+    "folder": "rhino",
+    "first_image_desc": "A rhinoceros stands near rocks and trees facing left.",
+    "last_image_desc": "The rhinoceros walks left with its head partially behind a tree.",
+    "challenge": "Occlusion",
+    "caption": "A rhinoceros walks left behind a tree."
+  },
+  {
+    "folder": "rhino-dirt",
+    "first_image_desc": "A rhinoceros stands on dirt with head lowered.",
+    "last_image_desc": "The rhinoceros has lifted its front leg and moved slightly forward.",
+    "challenge": "Linear motion",
+    "caption": "The rhinoceros steps forward on the dirt."
+  },
+  {
+    "folder": "rollerblade",
+    "first_image_desc": "A person on rollerblades moves left near a graffiti wall.",
+    "last_image_desc": "The person on rollerblades lands near the graffiti wall facing right.",
+    "challenge": "Large motion",
+    "caption": "A person on rollerblades jumps in front of a graffiti wall."
+  },
+  {
+    "folder": "rollercoaster",
+    "first_image_desc": "Roller coaster car at the top of an orange track.",
+    "last_image_desc": "Roller coaster car further right along the orange track.",
+    "challenge": "Linear motion",
+    "caption": "Roller coaster car moves right along the orange track."
+  },
+  {
+    "folder": "run-girl",
+    "first_image_desc": "Girl in yellow shirt stands in wheat field facing sunset.",
+    "last_image_desc": "Girl in yellow shirt turns in wheat field with arm extended.",
+    "challenge": "Linear motion",
+    "caption": "Girl runs forward through the wheat field."
+  },
+  {
+    "folder": "salsa",
+    "first_image_desc": "A group of dancers in sparkly outfits perform outdoors before a crowd.",
+    "last_image_desc": "The dancers have changed positions and are moving energetically in the same area.",
+    "challenge": "Large motion",
+    "caption": "Dancers move energetically in coordinated steps before the audience."
+  },
+  {
+    "folder": "santa",
+    "first_image_desc": "Man in Santa suit with headphones, head tilted back, hand raised.",
+    "last_image_desc": "Man in Santa suit with headphones, head bent forward, hands pointing down.",
+    "challenge": "Large motion",
+    "caption": "Santa dances with headphones near a decorated Christmas tree."
+  },
+  {
+    "folder": "schoolgirls",
+    "first_image_desc": "Four schoolchildren with backpacks stand near a wall and plants.",
+    "last_image_desc": "Four schoolchildren with backpacks stand near a wall and plants.",
+    "challenge": "Large motion",
+    "caption": "Schoolchildren wait together near a wall and potted plants."
+  },
+  {
+    "folder": "scooter-black",
+    "first_image_desc": "A person on a black scooter rides on a city street.",
+    "last_image_desc": "The person on the scooter has moved leftward along the street.",
+    "challenge": "Linear motion",
+    "caption": "A person rides a scooter leftward along the street."
+  },
+  {
+    "folder": "scooter-board",
+    "first_image_desc": "Man riding a hoverboard kart facing forward at an expo.",
+    "last_image_desc": "Man riding a hoverboard kart away from the camera on an expo floor.",
+    "challenge": "Large motion",
+    "caption": "Man rides a hoverboard kart forward across the expo floor."
+  },
+  {
+    "folder": "scooter-gray",
+    "first_image_desc": "A person on a scooter rides past parked scooters near a building.",
+    "last_image_desc": "The person on the scooter rides past a crosswalk and greenery.",
+    "challenge": "Linear motion",
+    "caption": "A person rides a scooter to the left."
+  },
+  {
+    "folder": "seasnake",
+    "first_image_desc": "A banded sea snake moves leftward over sandy ocean floor and algae.",
+    "last_image_desc": "The banded sea snake has moved further left among the algae and sand.",
+    "challenge": "Large motion",
+    "caption": "A banded sea snake swims across the ocean floor."
+  },
+  {
+    "folder": "sheep",
+    "first_image_desc": "A brown sheep and three lambs stand near a tree in a field.",
+    "last_image_desc": "The brown sheep and lambs stand further from the tree in the field.",
+    "challenge": "Large motion",
+    "caption": "Sheep and lambs walk away from the tree in the field."
+  },
+  {
+    "folder": "shooting",
+    "first_image_desc": "Man in tactical gear holds rope and gun, facing forward.",
+    "last_image_desc": "Man in tactical gear holds rope and gun, facing left.",
+    "challenge": "Large motion",
+    "caption": "A man is shooting a gun while rappelling down a rope."
+  },
+  {
+    "folder": "skate-jump",
+    "first_image_desc": "A person on a skateboard approaches a picnic table from the left.",
+    "last_image_desc": "The person on the skateboard is partially hidden behind the picnic table.",
+    "challenge": "Occlusion",
+    "caption": "A skateboarder rides left and becomes hidden behind the picnic table."
+  },
+  {
+    "folder": "skate-park",
+    "first_image_desc": "A skateboarder rides down a concrete skatepark bowl.",
+    "last_image_desc": "The skateboarder moves further right along the skatepark bowl.",
+    "challenge": "Linear motion",
+    "caption": "A skateboarder rides rightward through the skatepark bowl."
+  },
+  {
+    "folder": "slackline",
+    "first_image_desc": "Person falling backward off a slackline in a park.",
+    "last_image_desc": "Person upside down above a slackline in a park.",
+    "challenge": "Large motion",
+    "caption": "Person flips backward above the slackline."
+  },
+  {
+    "folder": "snowboard",
+    "first_image_desc": "Person snowboarding on a snowy slope facing left.",
+    "last_image_desc": "Person snowboarding on a snowy slope facing right.",
+    "challenge": "Linear motion",
+    "caption": "The snowboarder is riding down the slope."
+  },
+  {
+    "folder": "soapbox",
+    "first_image_desc": "Soapbox car with two people approaches a wooden ramp on the street.",
+    "last_image_desc": "Soapbox car with two people begins to ascend the wooden ramp.",
+    "challenge": "Linear motion",
+    "caption": "Soapbox car moves forward toward the wooden ramp."
+  },
+  {
+    "folder": "soccer",
+    "first_image_desc": "Person in gray sweatshirt balances soccer ball on foot outdoors.",
+    "last_image_desc": "Person in gray sweatshirt juggles soccer ball higher off the ground.",
+    "challenge": "Large motion",
+    "caption": "Soccer ball is kicked upward by the person's foot."
+  },
+  {
+    "folder": "soccerball",
+    "first_image_desc": "A blue and white soccer ball near a tree on grass.",
+    "last_image_desc": "The soccer ball is behind the tree trunk on the left.",
+    "challenge": "Occlusion",
+    "caption": "A soccer ball rolls left behind the tree trunk."
+  },
+  {
+    "folder": "squirrel",
+    "first_image_desc": "A small rodent sits upright eating with its paws.",
+    "last_image_desc": "The rodent sits upright eating, its head turned slightly right.",
+    "challenge": "Near-static",
+    "caption": "The rodent is eating its food."
+  },
+  {
+    "folder": "stretch-girl",
+    "first_image_desc": "Woman in white sitting cross-legged on grass with hands on knees.",
+    "last_image_desc": "Woman in white sitting cross-legged with arms extended forward.",
+    "challenge": "Large motion",
+    "caption": "Woman extends her arms forward while sitting cross-legged on grass."
+  },
+  {
+    "folder": "stroller",
+    "first_image_desc": "Woman pushing a stroller with a child past a shop window.",
+    "last_image_desc": "Woman and stroller have moved further right along the shop window.",
+    "challenge": "Linear motion",
+    "caption": "Woman pushes stroller right past shop window."
+  },
+  {
+    "folder": "stunt",
+    "first_image_desc": "Person on scooter jumping above a ramp in a skatepark.",
+    "last_image_desc": "Person on scooter landing on the ramp in a skatepark.",
+    "challenge": "Large motion",
+    "caption": "A person riding a scooter is riding down the slope."
+  },
+  {
+    "folder": "subway",
+    "first_image_desc": "Several people walk on a subway platform near a bench and train.",
+    "last_image_desc": "Fewer people remain as others have exited the subway platform scene.",
+    "challenge": "Occlusion",
+    "caption": "People walk past a bench on the subway platform."
+  },
+  {
+    "folder": "sunset",
+    "first_image_desc": "Sailboat on calm sea with large orange sun at sunset.",
+    "last_image_desc": "Sailboat farther right on calm sea with large orange sun at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Sailboat moves right across the sea at sunset."
+  },
+  {
+    "folder": "sunset-girl",
+    "first_image_desc": "Woman holding lights stands on beach at sunset.",
+    "last_image_desc": "Woman holding lights walks further right on beach at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Woman walks right holding lights at sunset."
+  },
+  {
+    "folder": "sunset-walk",
+    "first_image_desc": "Person's legs entering from right on a path at sunset.",
+    "last_image_desc": "Person walking away on the path toward the sunset.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward along the path toward the sunset."
+  },
+  {
+    "folder": "surf",
+    "first_image_desc": "Windsurfer with green sail moves right on blue water.",
+    "last_image_desc": "Windsurfer with green sail farther right on blue water.",
+    "challenge": "Linear motion",
+    "caption": "Windsurfer sails rightward across the water."
+  },
+  {
+    "folder": "sweep",
+    "first_image_desc": "Broom sweeping debris toward a red dustpan on wooden floor.",
+    "last_image_desc": "Broom near dustpan with most debris swept up from the floor.",
+    "challenge": "Large motion",
+    "caption": "Broom sweeps debris toward the dustpan on the floor."
+  },
+  {
+    "folder": "swing",
+    "first_image_desc": "Woman sitting still on a swing holding black object.",
+    "last_image_desc": "Woman leaning back swinging forward holding black object.",
+    "challenge": "Large motion",
+    "caption": "Woman swings forward on a playground swing."
+  },
+  {
+    "folder": "tandem",
+    "first_image_desc": "Two people paragliding high above a green valley with mountains.",
+    "last_image_desc": "Two people paragliding closer to a rocky cliff and green hills.",
+    "challenge": "Large motion",
+    "caption": "Two people paraglide forward above a mountainous landscape."
+  },
+  {
+    "folder": "tennis",
+    "first_image_desc": "Man in white shirt prepares to hit tennis ball on clay court.",
+    "last_image_desc": "Man jumps and swings racket at tennis ball in midair.",
+    "challenge": "Large motion",
+    "caption": "Man runs to the left and hits tennis ball with racket."
+  },
+  {
+    "folder": "tennis-vest",
+    "first_image_desc": "Man stands ready on clay tennis court holding racket.",
+    "last_image_desc": "Man prepares to hit tennis ball with raised racket.",
+    "challenge": "Large motion",
+    "caption": "Man moves to hit tennis ball with racket."
+  },
+  {
+    "folder": "tiger-tree",
+    "first_image_desc": "A tiger walks past a large fallen tree.",
+    "last_image_desc": "The tiger has moved forward with its head closer to the tree.",
+    "challenge": "Large motion",
+    "caption": "A tiger walks forward past a fallen tree."
+  },
+  {
+    "folder": "tractor",
+    "first_image_desc": "Green Claas Axion 830 tractor towing a red trailer on a dirt road.",
+    "last_image_desc": "Tractor and trailer have moved right with dust rising from the road.",
+    "challenge": "Large motion",
+    "caption": "Tractor and trailer drive right on a dusty rural road."
+  },
+  {
+    "folder": "tractor-green",
+    "first_image_desc": "A beige truck is angled left on a grassy field near a ditch.",
+    "last_image_desc": "The beige truck has rotated further left on the grassy field.",
+    "challenge": "Large motion",
+    "caption": "The truck moves to the right on the grassy field."
+  },
+  {
+    "folder": "tractor-sand",
+    "first_image_desc": "A person drives a red tractor on a sandy arena.",
+    "last_image_desc": "The tractor has moved left and is partially out of view.",
+    "challenge": "Large motion",
+    "caption": "The tractor moves left across the sandy arena."
+  },
+  {
+    "folder": "train",
+    "first_image_desc": "A blue model train rounds a curve near a station and trees.",
+    "last_image_desc": "The blue model train has advanced further along the curved track.",
+    "challenge": "Large motion",
+    "caption": "A blue model train moves forward along a curved track."
+  },
+  {
+    "folder": "train-snow",
+    "first_image_desc": "A train approaches on snowy tracks with a red signal light.",
+    "last_image_desc": "The train is closer on the snowy tracks with the red signal unchanged.",
+    "challenge": "Large motion",
+    "caption": "A train moves forward through heavy falling snow."
+  },
+  {
+    "folder": "tuk-tuk",
+    "first_image_desc": "Three people sit together in a vehicle outdoors.",
+    "last_image_desc": "Three people sit together smiling. The girl on the left looks right.",
+    "challenge": "Large motion",
+    "caption": "The girl on the far left points to the right with her hand."
+  },
+  {
+    "folder": "upside-down",
+    "first_image_desc": "Man and girl seated on amusement park ride, man looking left.",
+    "last_image_desc": "Man and girl on ride, both facing forward, girl mouth open.",
+    "challenge": "Large motion",
+    "caption": "Man and girl rotate forward on amusement park ride."
+  },
+  {
+    "folder": "varanus-cage",
+    "first_image_desc": "Lizard on a branch facing right in a terrarium.",
+    "last_image_desc": "Lizard on a branch facing left near a rope in a terrarium.",
+    "challenge": "Large motion",
+    "caption": "Lizard walks to the left along the branch."
+  },
+  {
+    "folder": "walking",
+    "first_image_desc": "Man and woman walking on city sidewalk. Man looks at camera.",
+    "last_image_desc": "Man and woman continue walking. Woman looks left. Man looks forward.",
+    "challenge": "Large motion",
+    "caption": "Woman raises hand while walking behind man on sidewalk."
+  },
+  {
+    "folder": "woman-cry",
+    "first_image_desc": "Woman sits on bed covering her face. Man sits behind her.",
+    "last_image_desc": "Woman remains seated covering her face. Man sits behind her holding phone.",
+    "challenge": "Near-static",
+    "caption": "Woman sits on bed covering her face with hands."
+  },
+  {
+    "folder": "worry",
+    "first_image_desc": "Man with hand on chin looking down and left.",
+    "last_image_desc": "Man with hand on chin looking down and right.",
+    "challenge": "Near-static",
+    "caption": "Man turns his gaze to the right, lost in thought."
+  },
+  {
+    "folder": "writing",
+    "first_image_desc": "Person in black shirt writes on paper beside a laptop.",
+    "last_image_desc": "Person in black shirt continues writing on paper beside a laptop.",
+    "challenge": "Near-static",
+    "caption": "Person writes on paper next to an open laptop."
+  }
+]

33_dataset_caption.json

@@ -0,0 +1,1528 @@
+[
+  {
+    "folder": "dog-leg",
+    "first_image_desc": "Dog swimming underwater with front legs extended forward.",
+    "last_image_desc": "Dog swimming underwater with front legs extended backward.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog swims underwater with legs moving backward."
+  },
+  {
+    "folder": "meerkat",
+    "first_image_desc": "Two meerkats are visible facing left.",
+    "last_image_desc": "Only one meerkat remains visible facing left.",
+    "challenge": "Occlusion",
+    "caption": "The right meerkat moves out of view to the right."
+  },
+  {
+    "folder": "knife",
+    "first_image_desc": "Hand holds knife above cabbage on cutting board.",
+    "last_image_desc": "Knife slices through cabbage held by hand on cutting board.",
+    "challenge": "Dynamic motion",
+    "caption": "Knife slices downward through cabbage."
+  },
+  {
+    "folder": "butterfly",
+    "first_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "last_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "challenge": "Near-static",
+    "caption": "Butterfly remains still on the marigold flower."
+  },
+  {
+    "folder": "person-hand",
+    "first_image_desc": "Person in white with arm relaxed at side.",
+    "last_image_desc": "Person in white with arm extended forward.",
+    "challenge": "Linear motion",
+    "caption": "Person extends arm forward."
+  },
+  {
+    "folder": "elephant-apple",
+    "first_image_desc": "Man holds apple near elephant with trunk raised.",
+    "last_image_desc": "Man lifts apple higher as elephant opens mouth wider.",
+    "challenge": "Dynamic motion",
+    "caption": "Man raises apple toward elephant with open mouth."
+  },
+  {
+    "folder": "person-sunset",
+    "first_image_desc": "Person in water facing sunset with arms down.",
+    "last_image_desc": "Person in water facing sunset with both hands on head.",
+    "challenge": "Dynamic motion",
+    "caption": "Person raises both hands to head in the water."
+  },
+  {
+    "folder": "child-run",
+    "first_image_desc": "A child in blue and red runs along a dirt path in a field.",
+    "last_image_desc": "The child is farther along the dirt path in the field.",
+    "challenge": "Linear motion",
+    "caption": "A child runs forward along a dirt path in the field."
+  },
+  {
+    "folder": "wood-shave",
+    "first_image_desc": "Person holds a hand planer at the edge of a wooden board.",
+    "last_image_desc": "Person pushes the hand planer forward creating wood shavings.",
+    "challenge": "Linear motion",
+    "caption": "Hand planer moves forward shaving the wooden board."
+  },
+  {
+    "folder": "run-smoke",
+    "first_image_desc": "Two people run on a beach with purple smoke.",
+    "last_image_desc": "Two people run on a beach with purple smoke trailing behind.",
+    "challenge": "Dynamic motion",
+    "caption": "Two people run forward holding a purple smoke flare."
+  },
+  {
+    "folder": "woman-arm",
+    "first_image_desc": "Woman in blue shirt with arms partly outstretched in a field.",
+    "last_image_desc": "Woman in blue shirt with arms fully outstretched facing sideways.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman raises arms and turns to the side in the field."
+  },
+  {
+    "folder": "kangaroo",
+    "first_image_desc": "A kangaroo stands on grass with its head turned left.",
+    "last_image_desc": "The kangaroo stands on grass with its head turned more forward.",
+    "challenge": "Dynamic motion",
+    "caption": "Kangaroo turns its head slightly toward the front."
+  },
+  {
+    "folder": "surfer",
+    "first_image_desc": "Two surfers holding boards run toward the ocean on wet sand.",
+    "last_image_desc": "Both surfers are farther from the camera running toward the water.",
+    "challenge": "Dynamic motion",
+    "caption": "Two surfers run toward the ocean carrying surfboards."
+  },
+  {
+    "folder": "jog-tree",
+    "first_image_desc": "Person jogging away on a leaf-covered path in a forest.",
+    "last_image_desc": "Person is farther down the same forest path under autumn trees.",
+    "challenge": "Linear motion",
+    "caption": "Person jogs away along the forest path."
+  },
+  {
+    "folder": "walk-snow",
+    "first_image_desc": "Two people walk away on a snowy forest path.",
+    "last_image_desc": "Two people further along the snowy path in the forest.",
+    "challenge": "Dynamic motion",
+    "caption": "Two people walk along a snowy forest path."
+  },
+  {
+    "folder": "goat-grass",
+    "first_image_desc": "A chamois stands on grass facing away.",
+    "last_image_desc": "The chamois turns its head to the left.",
+    "challenge": "Dynamic motion",
+    "caption": "A chamois turns its head to the left."
+  },
+  {
+    "folder": "rooster",
+    "first_image_desc": "A rooster stands on a branch facing forward with head turned left.",
+    "last_image_desc": "The rooster stands on the branch facing forward with head turned right.",
+    "challenge": "Linear motion",
+    "caption": "Rooster turns its head from left to right."
+  },
+  {
+    "folder": "suv-road",
+    "first_image_desc": "One SUV far on a dirt road another at the left edge.",
+    "last_image_desc": "Two SUVs driving away on dirt tracks in open terrain.",
+    "challenge": "Dynamic motion",
+    "caption": "SUV drives onto the dirt road following another SUV."
+  },
+  {
+    "folder": "dog-grass",
+    "first_image_desc": "A dog stands in tall green grass facing forward.",
+    "last_image_desc": "The dog is closer in the grass, running forward.",
+    "challenge": "Dynamic motion",
+    "caption": "A dog runs forward through tall green grass."
+  },
+  {
+    "folder": "curly-hair",
+    "first_image_desc": "Hand holds a section of curly hair on the right.",
+    "last_image_desc": "Hand is moving away from the curly hair on the right.",
+    "challenge": "Dynamic motion",
+    "caption": "Hand moves away from the curly hair on the right."
+  },
+  {
+    "folder": "car-highway",
+    "first_image_desc": "A red car and a white car drive side by side on a highway.",
+    "last_image_desc": "A black car passes between the red and white cars on the highway.",
+    "challenge": "Dynamic motion",
+    "caption": "The cars are moving forward on the highway."
+  },
+  {
+    "folder": "hummingbird",
+    "first_image_desc": "Hummingbird hovers near pink flowers with wings blurred.",
+    "last_image_desc": "Hummingbird faces downward feeding from pink flowers.",
+    "challenge": "Dynamic motion",
+    "caption": "Hummingbird hovers near pink flowers."
+  },
+  {
+    "folder": "duckling",
+    "first_image_desc": "Yellow duckling sitting on grass facing left.",
+    "last_image_desc": "Yellow duckling sitting on grass facing right.",
+    "challenge": "Linear motion",
+    "caption": "Duckling turns its head from left to right."
+  },
+  {
+    "folder": "man-bridge",
+    "first_image_desc": "A man runs toward the camera on a misty bridge.",
+    "last_image_desc": "The man is much closer to the camera on the same bridge.",
+    "challenge": "Dynamic motion",
+    "caption": "A man runs forward on a misty bridge."
+  },
+  {
+    "folder": "skateboard",
+    "first_image_desc": "Person stands on skateboard with arm raised in sunlight.",
+    "last_image_desc": "Person rides skateboard forward with arms lowered.",
+    "challenge": "Dynamic motion",
+    "caption": "Person rides skateboard forward on open pavement."
+  },
+  {
+    "folder": "woman-exercise",
+    "first_image_desc": "Woman in pink workout clothes lifts left knee indoors.",
+    "last_image_desc": "Woman in pink workout clothes stands with both feet down.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman lowers left leg while exercising indoors."
+  },
+  {
+    "folder": "walk-bench",
+    "first_image_desc": "Person walking on a grassy path at sunrise.",
+    "last_image_desc": "Person farther left on the path with sun in background.",
+    "challenge": "Linear motion",
+    "caption": "Person walks along the path at sunrise."
+  },
+  {
+    "folder": "dog-frisbee",
+    "first_image_desc": "Two dogs run toward a flying orange frisbee on the beach.",
+    "last_image_desc": "One dog holds the orange frisbee while running beside the other dog.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog catches orange frisbee while running on the beach."
+  },
+  {
+    "folder": "cyclist-road",
+    "first_image_desc": "A cyclist is at the left edge of a rural road.",
+    "last_image_desc": "The cyclist is centered and closer on the rural road.",
+    "challenge": "Dynamic motion",
+    "caption": "A cyclist moves forward along a rural road."
+  },
+  {
+    "folder": "dog-soccer",
+    "first_image_desc": "A black and white dog runs toward a soccer ball on sand.",
+    "last_image_desc": "The dog is close to the ball, kicking up sand with its paw.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog chases and kicks a soccer ball on the sandy beach."
+  },
+  {
+    "folder": "penguin",
+    "first_image_desc": "A penguin stands on a rock with its head upright.",
+    "last_image_desc": "The penguin stands on a rock with its head bent down.",
+    "challenge": "Dynamic motion",
+    "caption": "Penguin lowers its head while standing on the rock."
+  },
+  {
+    "folder": "man-lake",
+    "first_image_desc": "Person preparing to jump off a dock into a lake.",
+    "last_image_desc": "Large splash in the lake near the dock. Person not visible.",
+    "challenge": "Occlusion",
+    "caption": "Person jumps off dock into the lake."
+  },
+  {
+    "folder": "burger",
+    "first_image_desc": "Open sandwich bun with vegetables on a black tray.",
+    "last_image_desc": "Hand holding a cooked patty on top of the sandwich bun.",
+    "challenge": "Occlusion",
+    "caption": "Hand places burger patty onto the sandwich bun."
+  },
+  {
+    "folder": "dog-pavement",
+    "first_image_desc": "A small dog runs toward the camera on a paved area.",
+    "last_image_desc": "The dog stands closer to the camera, facing left on the pavement.",
+    "challenge": "Dynamic motion",
+    "caption": "A dog runs forward and turns to the left."
+  },
+  {
+    "folder": "children-dance",
+    "first_image_desc": "A boy and girl face each other holding hands outdoors.",
+    "last_image_desc": "The boy and girl have rotated, stepping forward while holding hands.",
+    "challenge": "Dynamic motion",
+    "caption": "Two children rotate while dancing together outside."
+  },
+  {
+    "folder": "woman-rocky",
+    "first_image_desc": "Woman stands on rocky ground with left arm lowered.",
+    "last_image_desc": "Woman stands on rocky ground with left arm raised upward.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman raises her left arm while stretching outdoors."
+  },
+  {
+    "folder": "parrot",
+    "first_image_desc": "Red parrot faces left with beak visible.",
+    "last_image_desc": "Red parrot faces forward with beak centered.",
+    "challenge": "Linear motion",
+    "caption": "Parrot turns head from left to forward."
+  },
+  {
+    "folder": "wakeboarder",
+    "first_image_desc": "Person in orange vest wakeboarding leftward on a lake.",
+    "last_image_desc": "Person in orange vest wakeboarding farther left with water spray.",
+    "challenge": "Dynamic motion",
+    "caption": "Wakeboarder moves quickly across the lake."
+  },
+  {
+    "folder": "dog-park",
+    "first_image_desc": "A small black and white dog stands on grass facing left.",
+    "last_image_desc": "The dog stands on grass facing forward toward the camera.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog turns from left to face forward on the grass."
+  },
+  {
+    "folder": "woman-hand",
+    "first_image_desc": "Woman in black top raises right hand with index finger up.",
+    "last_image_desc": "Woman in black top holds both hands on her head.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman lifts both hands to touch her head."
+  },
+  {
+    "folder": "lion-yawn",
+    "first_image_desc": "Two lions rest against a rock wall. One lion's mouth is open.",
+    "last_image_desc": "Two lions rest. The front lion's mouth is wider and tongue extended.",
+    "challenge": "Linear motion",
+    "caption": "Lion opens mouth wider and extends tongue upward."
+  },
+  {
+    "folder": "cyclist-four",
+    "first_image_desc": "Three cyclists ride away on a tree-lined path.",
+    "last_image_desc": "Four cyclists ride away on a tree-lined path.",
+    "challenge": "Occlusion",
+    "caption": "A fourth cyclist enters the path from the left."
+  },
+  {
+    "folder": "husky",
+    "first_image_desc": "A husky stands on grass with mouth open facing left.",
+    "last_image_desc": "The husky sits on grass facing slightly right with mouth closed.",
+    "challenge": "Dynamic motion",
+    "caption": "The husky sits down on the grassy field."
+  },
+  {
+    "folder": "smile-boy",
+    "first_image_desc": "Smiling boy in orange shirt rides bicycle facing left outdoors.",
+    "last_image_desc": "Smiling boy in orange shirt rides bicycle further left outdoors.",
+    "challenge": "Dynamic motion",
+    "caption": "Smiling boy rides bicycle in a park."
+  },
+  {
+    "folder": "city",
+    "first_image_desc": "Blurry city skyline with beach and ocean on a sunny day.",
+    "last_image_desc": "Blurry city skyline with beach and ocean on a sunny day.",
+    "challenge": "Near-static",
+    "caption": "Blurry city skyline and beach remain unchanged."
+  },
+  {
+    "folder": "silver-car",
+    "first_image_desc": "Front half of a silver car entering a railroad crossing.",
+    "last_image_desc": "Entire silver car fully visible at the railroad crossing.",
+    "challenge": "Linear motion",
+    "caption": "Silver car moves forward across the railroad crossing."
+  },
+  {
+    "folder": "salad",
+    "first_image_desc": "Hands holding spoons above a bowl of fruit salad.",
+    "last_image_desc": "Spoons lifted above the bowl of fruit salad.",
+    "challenge": "Dynamic motion",
+    "caption": "Spoons are lifted out of the fruit salad bowl."
+  },
+  {
+    "folder": "hand-water",
+    "first_image_desc": "Hands near a stream of water without touching it.",
+    "last_image_desc": "Hands rubbing together directly under running water.",
+    "challenge": "Dynamic motion",
+    "caption": "Hands move under water and begin rubbing together."
+  },
+  {
+    "folder": "aerobatics",
+    "first_image_desc": "Person in cockpit of glider flying above patchwork fields.",
+    "last_image_desc": "Person in cockpit of glider with fields rotated nearly vertical.",
+    "challenge": "Large motion",
+    "caption": "Glider floats over fields with man holding control stick."
+  },
+  {
+    "folder": "air-conditioner",
+    "first_image_desc": "Hand holding remote showing 21°C in front of air conditioner.",
+    "last_image_desc": "Hand holding remote showing 23°C in front of air conditioner.",
+    "challenge": "Near-static",
+    "caption": "Remote temperature increases from 21 to 23 degrees Celsius."
+  },
+  {
+    "folder": "baby-duck",
+    "first_image_desc": "Duckling swimming on water with head above surface.",
+    "last_image_desc": "Duckling swimming with head submerged underwater.",
+    "challenge": "Occlusion",
+    "caption": "The duck swims to the left and dips its head in the water."
+  },
+  {
+    "folder": "beach-ball",
+    "first_image_desc": "Man with ball and dog near water, woman stands on sand.",
+    "last_image_desc": "Ball is midair between man and woman, dog runs toward woman.",
+    "challenge": "Large motion",
+    "caption": "Man throws red ball toward woman on the beach."
+  },
+  {
+    "folder": "beach-metal",
+    "first_image_desc": "Person with metal detector walking on sandy beach facing ocean.",
+    "last_image_desc": "Person stands on beach holding metal detector over sand.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward on the beach with a metal detector."
+  },
+  {
+    "folder": "bear",
+    "first_image_desc": "A brown bear walks left beside large rocks and a stone wall.",
+    "last_image_desc": "The brown bear is closer to the rocks and stone wall, still walking left.",
+    "challenge": "Large motion",
+    "caption": "The bear walks left toward the large rock."
+  },
+  {
+    "folder": "bench-swing",
+    "first_image_desc": "A wooden porch swing hangs still between two posts.",
+    "last_image_desc": "The wooden porch swing is angled forward between the posts.",
+    "challenge": "Large motion",
+    "caption": "The swing swings back and forth."
+  },
+  {
+    "folder": "bike-packing",
+    "first_image_desc": "Person in cycling kit leans over upright bicycle indoors.",
+    "last_image_desc": "Person bends lower over bicycle with rear wheel above bike case.",
+    "challenge": "Large motion",
+    "caption": "The man examines the bicycle and then lifts it toward the open bike case."
+  },
+  {
+    "folder": "bird",
+    "first_image_desc": "White cockatoo perched on a branch with wings raised.",
+    "last_image_desc": "White cockatoo perched on a branch with wings folded down.",
+    "challenge": "Large motion",
+    "caption": "The white cockatoo keeps sitting on the branch and then getting up again."
+  },
+  {
+    "folder": "bird-tail",
+    "first_image_desc": "Small brown bird stands on mossy branch with wings raised.",
+    "last_image_desc": "Small brown bird stands on mossy branch with wings spread wide.",
+    "challenge": "Large motion",
+    "caption": "Bird is dancing, flapping its wings and shaking its tail feathers."
+  },
+  {
+    "folder": "blackswan",
+    "first_image_desc": "A black swan swims in a pond near a concrete edge.",
+    "last_image_desc": "The black swan has moved slightly forward in the pond.",
+    "challenge": "Linear motion",
+    "caption": "A black swan is swimming forward."
+  },
+  {
+    "folder": "bmx-bumps",
+    "first_image_desc": "A person in motocross gear rides a bicycle on a dirt track.",
+    "last_image_desc": "The person on the bicycle is mostly out of view to the left.",
+    "challenge": "Large motion",
+    "caption": "A BMX rider jumps over a dirt ramp."
+  },
+  {
+    "folder": "bmx-trees",
+    "first_image_desc": "Boy in white shirt rides bicycle past colorful mural.",
+    "last_image_desc": "Boy on bicycle continues riding past mural with soccer ball art.",
+    "challenge": "Large motion",
+    "caption": "A boy rides his bicycle forward, passing trees and murals."
+  },
+  {
+    "folder": "boat",
+    "first_image_desc": "A white fishing boat moves right on calm blue water near shore.",
+    "last_image_desc": "The fishing boat has moved further right along the shoreline.",
+    "challenge": "Linear motion",
+    "caption": "A fishing boat slowly moves leftward across the water."
+  },
+  {
+    "folder": "book",
+    "first_image_desc": "An open book lies on sand with blank pages visible.",
+    "last_image_desc": "An open book lies on sand with pages turning in the wind.",
+    "challenge": "Large motion",
+    "caption": "Book pages flip upward in the wind."
+  },
+  {
+    "folder": "bowl",
+    "first_image_desc": "Hand holds mallet above brass singing bowl in snowy forest.",
+    "last_image_desc": "Hand holds mallet beside brass singing bowl in snowy forest.",
+    "challenge": "Large motion",
+    "caption": "The mallet sweeps counterclockwise around the brass singing bowl."
+  },
+  {
+    "folder": "boxing-fisheye",
+    "first_image_desc": "Two boxers with headgear face each other in a ring outdoors.",
+    "last_image_desc": "Boxers have moved positions and are closer together in the ring.",
+    "challenge": "Large motion",
+    "caption": "Boxers are punching toward each other."
+  },
+  {
+    "folder": "boy-bike",
+    "first_image_desc": "A boy rides a bicycle on a rural road.",
+    "last_image_desc": "The boy on the bicycle is closer on the rural road.",
+    "challenge": "Linear motion",
+    "caption": "A boy rides a bicycle forward along the road."
+  },
+  {
+    "folder": "breakdance",
+    "first_image_desc": "Dancer in red sweatshirt balances upside down on one hand.",
+    "last_image_desc": "Dancer in red sweatshirt balances on both hands with legs raised.",
+    "challenge": "Large motion",
+    "caption": "Breakdancer spins from handstand to rolling on the ground."
+  },
+  {
+    "folder": "breakdance-flare",
+    "first_image_desc": "Person balances on one hand with one leg raised high.",
+    "last_image_desc": "Person spins on one hand with legs extended outward.",
+    "challenge": "Large motion",
+    "caption": "Person spins on one hand with legs sweeping outward."
+  },
+  {
+    "folder": "brown-sheep",
+    "first_image_desc": "A brown goat stands on green grass facing left.",
+    "last_image_desc": "The brown goat lowers its head toward the grass.",
+    "challenge": "Large motion",
+    "caption": "Goat lowers its head toward the ground."
+  },
+  {
+    "folder": "bus",
+    "first_image_desc": "A blue and white city bus approaches a yield sign on a street.",
+    "last_image_desc": "The bus moves forward past the yield sign and street sign.",
+    "challenge": "Linear motion",
+    "caption": "A city bus moves forward along the street."
+  },
+  {
+    "folder": "camel",
+    "first_image_desc": "A camel stands near a wooden fence facing right.",
+    "last_image_desc": "A camel walks closer to the wooden fence facing right.",
+    "challenge": "Large motion",
+    "caption": "Camel walks toward the wooden fence on the right."
+  },
+  {
+    "folder": "camel-white",
+    "first_image_desc": "A white camel stands on grass facing right.",
+    "last_image_desc": "The white camel walks to the right with legs lifted.",
+    "challenge": "Large motion",
+    "caption": "The camel slowly walks forward on the grass."
+  },
+  {
+    "folder": "car-roundabout",
+    "first_image_desc": "Gray car turning right at a roundabout in a city.",
+    "last_image_desc": "Gray car driving straight past a monument at a roundabout.",
+    "challenge": "Linear motion",
+    "caption": "A gray car is circling the roundabout."
+  },
+  {
+    "folder": "car-shadow",
+    "first_image_desc": "A silver car turns left at an intersection.",
+    "last_image_desc": "The silver car continues left and approaches a crosswalk.",
+    "challenge": "Linear motion",
+    "caption": "A silver car is moving forward."
+  },
+  {
+    "folder": "car-turn",
+    "first_image_desc": "A silver SUV is driving on a mountain road near a curve.",
+    "last_image_desc": "The silver SUV is farther along the curve on the mountain road.",
+    "challenge": "Large motion",
+    "caption": "SUV drives forward along the winding mountain road."
+  },
+  {
+    "folder": "carousel",
+    "first_image_desc": "Colorful horse swings hang motionless in a playground.",
+    "last_image_desc": "Horse swings have shifted positions around the central pole.",
+    "challenge": "Large motion",
+    "caption": "Horse swings rotate counterclockwise around the blue pole."
+  },
+  {
+    "folder": "cat-girl",
+    "first_image_desc": "Girl holding a kitten close to her face, kitten's paw near her mouth.",
+    "last_image_desc": "Girl holding kitten out in front with both hands, kitten facing forward.",
+    "challenge": "Large motion",
+    "caption": "Girl lifts kitten upward in front of her."
+  },
+  {
+    "folder": "cats-car",
+    "first_image_desc": "Two children sit in a toy car holding kittens.",
+    "last_image_desc": "One child lifts an orange kitten higher while the other looks down.",
+    "challenge": "Large motion",
+    "caption": "Two children are laughing as they lift the cats."
+  },
+  {
+    "folder": "chamaleon",
+    "first_image_desc": "A green lizard stretches across branches with one leg raised.",
+    "last_image_desc": "The green lizard lifts both front legs higher while on the branches.",
+    "challenge": "Large motion",
+    "caption": "The lizard lifts its leg while climbing on branches."
+  },
+  {
+    "folder": "classic-car",
+    "first_image_desc": "A vintage black race car drives past a crowd outdoors.",
+    "last_image_desc": "Close-up of two men riding in the vintage race car past spectators.",
+    "challenge": "Large motion",
+    "caption": "Vintage race car moves left past a crowd of spectators."
+  },
+  {
+    "folder": "color-run",
+    "first_image_desc": "Hands reaching forward in a color run event with orange powder.",
+    "last_image_desc": "Hands much closer to the person in orange shirt throwing powder.",
+    "challenge": "Large motion",
+    "caption": "Hand with green powder moves closer to the color run participants."
+  },
+  {
+    "folder": "cook",
+    "first_image_desc": "A person holds a knife above an apple tart on a table.",
+    "last_image_desc": "The knife is pressed into the apple tart by the person.",
+    "challenge": "Large motion",
+    "caption": "A person slides the knife under the apple pie slice."
+  },
+  {
+    "folder": "cows",
+    "first_image_desc": "A brown and white cow stands on a dirt path facing right.",
+    "last_image_desc": "The cow stands further right on the dirt path facing right.",
+    "challenge": "Linear motion",
+    "caption": "A cow walks right along a dirt path."
+  },
+  {
+    "folder": "crossing",
+    "first_image_desc": "Two people begin crossing a street at a crosswalk.",
+    "last_image_desc": "Two people have moved further across the crosswalk.",
+    "challenge": "Large motion",
+    "caption": "Two people walk across the crosswalk from right to left."
+  },
+  {
+    "folder": "dance-jump",
+    "first_image_desc": "Girl in white and pink dress spins near stone fountain.",
+    "last_image_desc": "Girl in white and pink dress faces fountain with arms outstretched.",
+    "challenge": "Large motion",
+    "caption": "Girl in a pink dress is jumping and spinning near the stone fountain."
+  },
+  {
+    "folder": "dance-twirl",
+    "first_image_desc": "A woman in a blue dress dances before a seated audience.",
+    "last_image_desc": "The woman faces away with arms outstretched in front of the audience.",
+    "challenge": "Large motion",
+    "caption": "Dancer steps to the left while dancing."
+  },
+  {
+    "folder": "dancing",
+    "first_image_desc": "Two people begin dancing in the center of a street circle.",
+    "last_image_desc": "The two dancers face each other closely in the center of the circle.",
+    "challenge": "Large motion",
+    "caption": "Two people dance energetically in the center of a street circle."
+  },
+  {
+    "folder": "deer",
+    "first_image_desc": "Two deer facing each other on snowy ground under trees.",
+    "last_image_desc": "One deer partially hidden behind snow-covered branches.",
+    "challenge": "Occlusion",
+    "caption": "Two deer butt heads."
+  },
+  {
+    "folder": "desert-camel",
+    "first_image_desc": "Two people and two camels walking right on a sand dune at sunset.",
+    "last_image_desc": "Two people and two camels further right on the sand dune at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Two men lead camels across the desert at sunset."
+  },
+  {
+    "folder": "disc-jockey",
+    "first_image_desc": "Tattooed man stands beside masked person in hooded outfit.",
+    "last_image_desc": "Tattooed man raises both arms energetically beside masked person.",
+    "challenge": "Large motion",
+    "caption": "Tattooed man turns and raises arms."
+  },
+  {
+    "folder": "dog",
+    "first_image_desc": "Golden retriever with harness sniffs ground facing left.",
+    "last_image_desc": "Golden retriever with harness sniffs ground facing forward.",
+    "challenge": "Large motion",
+    "caption": "Dog walks forward across the dry grass."
+  },
+  {
+    "folder": "dog-bark",
+    "first_image_desc": "A Doberman with mouth closed looks forward on a leash.",
+    "last_image_desc": "The Doberman's head is turned left with mouth partially open.",
+    "challenge": "Large motion",
+    "caption": "Doberman barks, showing its teeth."
+  },
+  {
+    "folder": "dog-beach",
+    "first_image_desc": "A black and brown dog runs on a sandy beach.",
+    "last_image_desc": "The same dog continues running along the beach near the water.",
+    "challenge": "Large motion",
+    "caption": "The dog runs quickly to the left across the sandy beach."
+  },
+  {
+    "folder": "dog-gooses",
+    "first_image_desc": "A black and white dog crouches on grass near five ducks.",
+    "last_image_desc": "The dog moves forward on grass as the ducks walk away.",
+    "challenge": "Large motion",
+    "caption": "The ducks move right away from the crouching dog."
+  },
+  {
+    "folder": "dog-snow",
+    "first_image_desc": "A brown dog sits in falling snow facing forward.",
+    "last_image_desc": "The brown dog sits in snow looking to the left.",
+    "challenge": "Near-static",
+    "caption": "Dog turns its head left in falling snow."
+  },
+  {
+    "folder": "dog-swim",
+    "first_image_desc": "Dog splashing in shallow water facing left.",
+    "last_image_desc": "Dog splashing in shallow water facing forward.",
+    "challenge": "Large motion",
+    "caption": "Golden retriever runs through shallow water toward the viewer."
+  },
+  {
+    "folder": "dog-water",
+    "first_image_desc": "A black and white dog lies behind a white bowl on the floor.",
+    "last_image_desc": "The dog stands with its nose close to the white bowl.",
+    "challenge": "Large motion",
+    "caption": "Dog approaches the bowl from the background."
+  },
+  {
+    "folder": "dogs-jump",
+    "first_image_desc": "Person in yellow stands with two dogs on grass under cloudy sky.",
+    "last_image_desc": "One dog jumps up near person while another sniffs grass on left.",
+    "challenge": "Large motion",
+    "caption": "Dog jumps while another dog jumps and walks away on the grass."
+  },
+  {
+    "folder": "dogs-scale",
+    "first_image_desc": "A hand holds a small puppy near a kitchen scale on a table.",
+    "last_image_desc": "The hand lifts the puppy away from the scale and toward the camera.",
+    "challenge": "Large motion",
+    "caption": "A puppy is lifted onto a pink kitchen scale."
+  },
+  {
+    "folder": "drift-chicane",
+    "first_image_desc": "A red drift car enters a left turn trailing smoke.",
+    "last_image_desc": "The red drift car is deeper into the turn with more smoke.",
+    "challenge": "Large motion",
+    "caption": "A drift car slides rightward around a racetrack corner."
+  },
+  {
+    "folder": "drift-straight",
+    "first_image_desc": "A red race car approaches a curve on a racetrack.",
+    "last_image_desc": "The red race car is very close and partially out of view.",
+    "challenge": "Large motion",
+    "caption": "A red race car drifts quickly toward the viewer."
+  },
+  {
+    "folder": "drift-turn",
+    "first_image_desc": "A race car drifts around a corner with smoke behind it.",
+    "last_image_desc": "The race car drifts closer to the camera along the track.",
+    "challenge": "Large motion",
+    "caption": "A race car drifts right around a track corner."
+  },
+  {
+    "folder": "drone",
+    "first_image_desc": "Two men stand by a display of electronics and drones.",
+    "last_image_desc": "A small drone rests on the blue floor near people's feet.",
+    "challenge": "Large motion",
+    "caption": "The drone being controlled by the man falls to the ground."
+  },
+  {
+    "folder": "drum",
+    "first_image_desc": "Man in tank top and headphones playing drums with right arm raised.",
+    "last_image_desc": "Man in tank top and headphones playing drums with right arm lowered.",
+    "challenge": "Large motion",
+    "caption": "Drummer is passionately playing the drums."
+  },
+  {
+    "folder": "elephant",
+    "first_image_desc": "An elephant stands on a sandy path near rocks and trees.",
+    "last_image_desc": "The elephant has walked further right along the sandy path.",
+    "challenge": "Linear motion",
+    "caption": "An elephant walks right through a dusty enclosure."
+  },
+  {
+    "folder": "flamingo",
+    "first_image_desc": "Flamingo standing in water with head raised and neck curved.",
+    "last_image_desc": "Flamingo standing in water with head submerged and neck extended downward.",
+    "challenge": "Large motion",
+    "caption": "A flamingo lowers its head toward the water."
+  },
+  {
+    "folder": "four-walking",
+    "first_image_desc": "Five women in white walk down a cobblestone street.",
+    "last_image_desc": "Five women in white are closer on the cobblestone street.",
+    "challenge": "Large motion",
+    "caption": "Five people walk forward on a cobblestone street."
+  },
+  {
+    "folder": "frog",
+    "first_image_desc": "A green frog sits on wet pebbles facing left.",
+    "last_image_desc": "The green frog remains on wet pebbles in the same position.",
+    "challenge": "Near-static",
+    "caption": "A green frog remains still on the rocky ground."
+  },
+  {
+    "folder": "gazelle",
+    "first_image_desc": "A gazelle with open mouth lies on sandy ground.",
+    "last_image_desc": "A gazelle with closed mouth lies on sandy ground.",
+    "challenge": "Near-static",
+    "caption": "The gazelle is chewing something."
+  },
+  {
+    "folder": "giant-slalom",
+    "first_image_desc": "A skier in red suit and blue helmet on a snowy slope.",
+    "last_image_desc": "Empty snowy slope with red and blue slalom gates.",
+    "challenge": "Occlusion",
+    "caption": "A skier disappears behind a snowy hill on the course."
+  },
+  {
+    "folder": "girl-dog",
+    "first_image_desc": "Girl in wheelchair and dog moving on sidewalk near grass.",
+    "last_image_desc": "Girl in wheelchair and dog farther along sidewalk near tree.",
+    "challenge": "Large motion",
+    "caption": "Person in wheelchair and dog move forward on the sidewalk."
+  },
+  {
+    "folder": "girl-happy",
+    "first_image_desc": "Woman in white shirt smiling with arms outstretched looking right.",
+    "last_image_desc": "Woman in white shirt smiling with arms outstretched looking left.",
+    "challenge": "Large motion",
+    "caption": "Woman turns her head from right to left while smiling."
+  },
+  {
+    "folder": "girl-music",
+    "first_image_desc": "Woman with closed eyes holds headphones against ears.",
+    "last_image_desc": "Woman with partially open eyes holds headphones against ears.",
+    "challenge": "Near-static",
+    "caption": "The girl is swaying her head slightly from side to side as she feels the music."
+  },
+  {
+    "folder": "girl-smile",
+    "first_image_desc": "Girl in black jacket touches hair with both hands near head.",
+    "last_image_desc": "Girl in black jacket holds hair lower near neck with both hands.",
+    "challenge": "Large motion",
+    "caption": "Girl moves hands to tuck hair behind ears."
+  },
+  {
+    "folder": "girl-turn",
+    "first_image_desc": "Young girl in yellow dress faces forward holding skirt sides.",
+    "last_image_desc": "Young girl in yellow dress turns to her left looking down.",
+    "challenge": "Large motion",
+    "caption": "Girl in yellow dress turns left with her eyes closed."
+  },
+  {
+    "folder": "goat",
+    "first_image_desc": "A goat stands on rocky terrain facing away.",
+    "last_image_desc": "The goat steps forward on the rocky slope.",
+    "challenge": "Large motion",
+    "caption": "Goat walks rightward across rocky hillside."
+  },
+  {
+    "folder": "goat-branch",
+    "first_image_desc": "A brown goat stands under a horizontal branch in sunlight.",
+    "last_image_desc": "The brown goat remains under the branch in the same position.",
+    "challenge": "Near-static",
+    "caption": "A goat stands under a fallen tree branch."
+  },
+  {
+    "folder": "gold-fish",
+    "first_image_desc": "Five goldfish swimming in a blue-lit aquarium with plants and rocks.",
+    "last_image_desc": "Five goldfish have shifted positions in the blue-lit aquarium.",
+    "challenge": "Near-static",
+    "caption": "Goldfish swim slowly in a blue-lit aquarium."
+  },
+  {
+    "folder": "golf",
+    "first_image_desc": "Man walking toward a white golf cart on grass.",
+    "last_image_desc": "Man sitting inside the white golf cart on grass.",
+    "challenge": "Large motion",
+    "caption": "After a person gets into the car, it moves forward."
+  },
+  {
+    "folder": "gorilla",
+    "first_image_desc": "Adult and young gorilla visible among green leaves.",
+    "last_image_desc": "Young gorilla mostly hidden behind leaves beside adult gorilla.",
+    "challenge": "Occlusion",
+    "caption": "The young gorilla crouches down and gets hidden by the plants."
+  },
+  {
+    "folder": "guitar-violin",
+    "first_image_desc": "Man in suit plays violin with raised bow. Guitarist sits left.",
+    "last_image_desc": "Man in suit plays violin with lowered bow. Guitarist sits left.",
+    "challenge": "Large motion",
+    "caption": "Violinist is playing the violin."
+  },
+  {
+    "folder": "gym",
+    "first_image_desc": "Two women in gym attire stand near weights and bottles.",
+    "last_image_desc": "Woman in black picks up water bottle while other holds pink bottle.",
+    "challenge": "Occlusion",
+    "caption": "Both women squat and reach for bottles near the pillar."
+  },
+  {
+    "folder": "gym-pull",
+    "first_image_desc": "Man seated on gym machine with arms fully extended upward.",
+    "last_image_desc": "Man seated on gym machine with arms bent pulling bar to chest.",
+    "challenge": "Large motion",
+    "caption": "Man pulls lat pulldown bar from overhead to chest."
+  },
+  {
+    "folder": "gym-wave",
+    "first_image_desc": "Man in white shirt using battle ropes in gym.",
+    "last_image_desc": "Man in white shirt swings battle ropes upward in gym.",
+    "challenge": "Large motion",
+    "caption": "Man swings battle ropes up and down during workout."
+  },
+  {
+    "folder": "helicopter",
+    "first_image_desc": "Person in yellow vest faces helicopter hovering near ground.",
+    "last_image_desc": "Person in yellow vest stands as helicopter moves farther right.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward, watching hovering helicopter on the tarmac."
+  },
+  {
+    "folder": "hike",
+    "first_image_desc": "Man with backpack walking on rocky mountain trail.",
+    "last_image_desc": "Man with backpack continues walking on rocky mountain trail.",
+    "challenge": "Near-static",
+    "caption": "Man hikes forward on rocky mountain path."
+  },
+  {
+    "folder": "hike-man",
+    "first_image_desc": "Person with backpack walking on a forest path in sunlight.",
+    "last_image_desc": "Person with backpack farther along the same forest path.",
+    "challenge": "Linear motion",
+    "caption": "A person walks forward along a forest path."
+  },
+  {
+    "folder": "hockey",
+    "first_image_desc": "Man on rollerblades with hockey stick near small net and ball.",
+    "last_image_desc": "Man on rollerblades with hockey stick closer to net and ball.",
+    "challenge": "Large motion",
+    "caption": "The man moves to the right and assumes his stance to strike the puck."
+  },
+  {
+    "folder": "horsejump-high",
+    "first_image_desc": "Horse and rider approach a jump in an outdoor arena.",
+    "last_image_desc": "Horse and rider land after clearing the jump.",
+    "challenge": "Large motion",
+    "caption": "Horse and rider leap over the obstacle from left to right."
+  },
+  {
+    "folder": "horsejump-low",
+    "first_image_desc": "A rider on a white horse approaches a blue and white jump.",
+    "last_image_desc": "The rider and horse are airborne above the blue and white jump.",
+    "challenge": "Large motion",
+    "caption": "Horse and rider jump over a blue and white obstacle."
+  },
+  {
+    "folder": "horsejump-stick",
+    "first_image_desc": "A rider on a brown and white horse approaches a jump.",
+    "last_image_desc": "The rider and horse leap over a red and white jump.",
+    "challenge": "Large motion",
+    "caption": "Horse and rider move toward the jump."
+  },
+  {
+    "folder": "hoverboard",
+    "first_image_desc": "Person riding a hoverboard on a wet path near a railing.",
+    "last_image_desc": "Person on hoverboard much closer with only lower body visible.",
+    "challenge": "Large motion",
+    "caption": "Person rides a hoverboard to the left along the path."
+  },
+  {
+    "folder": "india",
+    "first_image_desc": "People walk and ride scooters on a sunlit street.",
+    "last_image_desc": "A man on a scooter passes close in front of the camera.",
+    "challenge": "Occlusion",
+    "caption": "A scooter passes in front of people walking on the street."
+  },
+  {
+    "folder": "judo",
+    "first_image_desc": "Two people in martial arts uniforms begin grappling on a mat.",
+    "last_image_desc": "One person lies on the mat while the other holds their arm.",
+    "challenge": "Large motion",
+    "caption": "A judo practitioner throws an opponent over his shoulder."
+  },
+  {
+    "folder": "kid-football",
+    "first_image_desc": "Boy in orange jersey and red cap faces soccer ball in air.",
+    "last_image_desc": "Boy in orange jersey and red cap stands without soccer ball visible.",
+    "challenge": "Large motion",
+    "caption": "Boy is performing a soccer ball kick-up."
+  },
+  {
+    "folder": "kite-surf",
+    "first_image_desc": "Person kiteboarding on turquoise water near shore.",
+    "last_image_desc": "Person kiteboarding farther right with water spray behind.",
+    "challenge": "Large motion",
+    "caption": "Kiteboarder moves quickly right across the water."
+  },
+  {
+    "folder": "kite-walk",
+    "first_image_desc": "Person in wetsuit and helmet stands on sandy beach with kiteboard.",
+    "last_image_desc": "Person in wetsuit and helmet walks rightward on sandy beach with kiteboard.",
+    "challenge": "Large motion",
+    "caption": "Kiteboarder walks backward along the sandy beach."
+  },
+  {
+    "folder": "koala",
+    "first_image_desc": "A koala climbs on a tree branch facing right.",
+    "last_image_desc": "The koala's head is mostly hidden behind the tree branch.",
+    "challenge": "Occlusion",
+    "caption": "Koala climbs right and head disappears behind tree branch."
+  },
+  {
+    "folder": "lab-coat",
+    "first_image_desc": "Three girls in lab coats stand on a grassy field.",
+    "last_image_desc": "Three girls in lab coats stand close to the camera on the field.",
+    "challenge": "Large motion",
+    "caption": "The camera gradually zooms in on the three girls in lab coats."
+  },
+  {
+    "folder": "lady-running",
+    "first_image_desc": "Elderly woman walking away from camera in a dining area.",
+    "last_image_desc": "Elderly woman farther from camera approaching a group of seated people.",
+    "challenge": "Large motion",
+    "caption": "Elderly woman runs forward through the dining area."
+  },
+  {
+    "folder": "libby",
+    "first_image_desc": "A dog runs left past a tree and wire fence.",
+    "last_image_desc": "A dog runs left behind a tree with green fruit.",
+    "challenge": "Occlusion",
+    "caption": "A dog runs quickly along a fenced garden path."
+  },
+  {
+    "folder": "lindy-hop",
+    "first_image_desc": "Several couples dance in a hall with wooden floors.",
+    "last_image_desc": "Couples continue dancing with different poses and positions.",
+    "challenge": "Large motion",
+    "caption": "Couples are dancing in pairs, moving around in a circle."
+  },
+  {
+    "folder": "loading",
+    "first_image_desc": "Man in black jacket lifts TV box near store shelf.",
+    "last_image_desc": "Man places TV box onto cart stacked with televisions.",
+    "challenge": "Large motion",
+    "caption": "Man is moving Samsung TV box from shelf to cart."
+  },
+  {
+    "folder": "lock",
+    "first_image_desc": "Hand holding a padlock and keys near a blue metal bar.",
+    "last_image_desc": "Hand turning a key in an open padlock on a blue metal bar.",
+    "challenge": "Large motion",
+    "caption": "The hand turns the key clockwise to unlock the lock."
+  },
+  {
+    "folder": "longboard",
+    "first_image_desc": "Person skateboarding on a path with a cyclist in the distance.",
+    "last_image_desc": "Person skateboarding closer to a cyclist approaching from the opposite direction.",
+    "challenge": "Large motion",
+    "caption": "Skateboarder moves forward as cyclist approaches on the path."
+  },
+  {
+    "folder": "lucia",
+    "first_image_desc": "Woman in black dress with yellow backpack walks on path leftward.",
+    "last_image_desc": "Woman in black dress with yellow backpack walks closer to bench.",
+    "challenge": "Large motion",
+    "caption": "Woman walks right toward a bench on a sunny path."
+  },
+  {
+    "folder": "makeup",
+    "first_image_desc": "A person with closed eyes is having makeup applied.",
+    "last_image_desc": "The person has opened their eyes and is looking forward.",
+    "challenge": "Occlusion",
+    "caption": "A woman opens her eyes after makeup is applied."
+  },
+  {
+    "folder": "mallard-fly",
+    "first_image_desc": "Duck standing on green grass near a flowing river.",
+    "last_image_desc": "Duck walking quickly on grass near the river.",
+    "challenge": "Large motion",
+    "caption": "A duck turns around and dashes forward."
+  },
+  {
+    "folder": "mallard-water",
+    "first_image_desc": "A brown duck swims on rippling water facing right.",
+    "last_image_desc": "The brown duck swims on water facing slightly more left.",
+    "challenge": "Near-static",
+    "caption": "A duck swims rightward across the pond."
+  },
+  {
+    "folder": "man",
+    "first_image_desc": "Man in blue shirt looking forward with neutral expression.",
+    "last_image_desc": "Man raises left arm across face partially covering his eyes.",
+    "challenge": "Large motion",
+    "caption": "The man brings his sleeve to his eyes to wipe away his tears."
+  },
+  {
+    "folder": "man-bike",
+    "first_image_desc": "Man with outstretched arms rides motorcycle in sunlight.",
+    "last_image_desc": "Man on motorcycle moves forward with arms outstretched in sunlight.",
+    "challenge": "Linear motion",
+    "caption": "Man rides motorcycle right with arms outstretched."
+  },
+  {
+    "folder": "man-eat",
+    "first_image_desc": "Man holding spoonful of food near open mouth.",
+    "last_image_desc": "Man chewing food with spoon lowered.",
+    "challenge": "Large motion",
+    "caption": "Man lifts food to his mouth with a spoon."
+  },
+  {
+    "folder": "mbike-trick",
+    "first_image_desc": "Motorcyclist facing forward with smoke starting to form behind rear tire.",
+    "last_image_desc": "Motorcyclist turning left with thick smoke billowing from rear tire.",
+    "challenge": "Large motion",
+    "caption": "The motorcycle is charging forward while spewing smoke."
+  },
+  {
+    "folder": "miami-surf",
+    "first_image_desc": "Several surfers ride a wave near the shore.",
+    "last_image_desc": "One surfer stands on a wave while another crouches in whitewater.",
+    "challenge": "Occlusion",
+    "caption": "A surfer falls off the board as another rides the wave."
+  },
+  {
+    "folder": "monkeys-trees",
+    "first_image_desc": "A monkey climbs a twisted branch near a tree trunk.",
+    "last_image_desc": "The monkey is higher on the branch, closer to the tree trunk.",
+    "challenge": "Large motion",
+    "caption": "The monkey climbs upward along the curved branch."
+  },
+  {
+    "folder": "motocross-bumps",
+    "first_image_desc": "A motocross rider approaches a dirt jump on a track.",
+    "last_image_desc": "The motocross rider lands and rides forward on the dirt track.",
+    "challenge": "Large motion",
+    "caption": "A motocross rider jumps over a dirt ramp."
+  },
+  {
+    "folder": "motocross-jump",
+    "first_image_desc": "Motocross rider approaches dirt jump in a forested area.",
+    "last_image_desc": "Motocross rider is airborne above the dirt track facing away.",
+    "challenge": "Large motion",
+    "caption": "Motocross rider jumps high over the dirt ramp."
+  },
+  {
+    "folder": "motorbike",
+    "first_image_desc": "Two people ride an orange motorcycle on a mountain road.",
+    "last_image_desc": "Two people ride an orange motorcycle past two large flower pots.",
+    "challenge": "Large motion",
+    "caption": "Motorcycle with two riders passes behind a large flower pot."
+  },
+  {
+    "folder": "mtb-race",
+    "first_image_desc": "Cyclist riding ahead on a dirt trail through a green forest.",
+    "last_image_desc": "Cyclist much closer on the same forest trail with handlebars visible.",
+    "challenge": "Large motion",
+    "caption": "Cyclist moves forward and get closer to another rider on a forest trail."
+  },
+  {
+    "folder": "night-race",
+    "first_image_desc": "Two sports cars drive inside a covered racetrack.",
+    "last_image_desc": "The blue sports car is much closer and blurred from speed.",
+    "challenge": "Occlusion",
+    "caption": "Two sports cars race forward inside the covered racetrack."
+  },
+  {
+    "folder": "orchid",
+    "first_image_desc": "Person holding a large orchid mount in front of face.",
+    "last_image_desc": "Person rotates orchid mount to show its side.",
+    "challenge": "Occlusion",
+    "caption": "Person rotates orchid mounted on bark to the right."
+  },
+  {
+    "folder": "paragliding",
+    "first_image_desc": "A paraglider is high above a green valley and village.",
+    "last_image_desc": "The paraglider has descended lower and moved right over the village.",
+    "challenge": "Linear motion",
+    "caption": "A paraglider moves leftward above a village and green valley."
+  },
+  {
+    "folder": "paragliding-launch",
+    "first_image_desc": "Person in paragliding gear stands on grassy hilltop.",
+    "last_image_desc": "Person in paragliding gear lifts off above grassy hill.",
+    "challenge": "Large motion",
+    "caption": "Paraglider runs and lifts off from grassy hillside."
+  },
+  {
+    "folder": "paragliding-sky",
+    "first_image_desc": "Paraglider with red canopy high in the sky above mountains.",
+    "last_image_desc": "Paraglider with red canopy has moved higher and further right in sky.",
+    "challenge": "Near-static",
+    "caption": "A paraglider moves leftward through the sky over mountains."
+  },
+  {
+    "folder": "parkour",
+    "first_image_desc": "Man jumps over a metal fence on a sunny day.",
+    "last_image_desc": "Man sits on top of a concrete wall with legs over the edge.",
+    "challenge": "Large motion",
+    "caption": "A man is running over fences and walls."
+  },
+  {
+    "folder": "people-sunset",
+    "first_image_desc": "Two people walk toward the ocean at sunset on a sandy path.",
+    "last_image_desc": "One person stands on the path as another crouches near a sign.",
+    "challenge": "Occlusion",
+    "caption": "People walk down a sandy trail toward the ocean at sunset."
+  },
+  {
+    "folder": "pigs",
+    "first_image_desc": "Three pigs standing on dirt, one pig facing left.",
+    "last_image_desc": "Three pigs standing on dirt, leftmost pig moved forward.",
+    "challenge": "Large motion",
+    "caption": "The pig on the far left steps forward."
+  },
+  {
+    "folder": "planes-water",
+    "first_image_desc": "Large airplane facing forward on a wet runway at dusk.",
+    "last_image_desc": "Large airplane facing forward slightly farther along the wet runway.",
+    "challenge": "Near-static",
+    "caption": "Airplane slowly taxis forward on wet runway."
+  },
+  {
+    "folder": "rabbit-cute",
+    "first_image_desc": "White and gray rabbit sitting in green grass near a wire fence.",
+    "last_image_desc": "White and gray rabbit remains in the same spot in green grass.",
+    "challenge": "Near-static",
+    "caption": "Rabbit sits still in the grass."
+  },
+  {
+    "folder": "rallye",
+    "first_image_desc": "A rally car is far down a dirt road approaching the camera.",
+    "last_image_desc": "The rally car is much closer on the dirt road raising dust.",
+    "challenge": "Large motion",
+    "caption": "A rally car speeds forward on a dirt road."
+  },
+  {
+    "folder": "rhino",
+    "first_image_desc": "A rhinoceros stands near rocks and a tree in a zoo enclosure.",
+    "last_image_desc": "A rhinoceros walks left with its head behind a tree trunk.",
+    "challenge": "Occlusion",
+    "caption": "A rhinoceros walks left behind a tree."
+  },
+  {
+    "folder": "rhino-dirt",
+    "first_image_desc": "A rhinoceros stands on dirt with head lowered.",
+    "last_image_desc": "The rhinoceros stands on dirt with head slightly raised.",
+    "challenge": "Linear motion",
+    "caption": "The rhinoceros steps forward on the dirt."
+  },
+  {
+    "folder": "rollerblade",
+    "first_image_desc": "Person on rollerblades skating left in front of graffiti wall.",
+    "last_image_desc": "Person on rollerblades crouched low skating right in front of graffiti wall.",
+    "challenge": "Large motion",
+    "caption": "A person on rollerblades jumps in front of a graffiti wall."
+  },
+  {
+    "folder": "rollercoaster",
+    "first_image_desc": "Roller coaster car with riders at the top of an orange track.",
+    "last_image_desc": "Roller coaster car with riders further along the orange track.",
+    "challenge": "Large motion",
+    "caption": "Roller coaster car moves right along the orange track."
+  },
+  {
+    "folder": "run-girl",
+    "first_image_desc": "Girl in yellow shirt stands in wheat field at sunset.",
+    "last_image_desc": "Girl in yellow shirt runs through wheat field with swinging hair.",
+    "challenge": "Linear motion",
+    "caption": "Girl runs forward through the wheat field."
+  },
+  {
+    "folder": "salsa",
+    "first_image_desc": "Dancers in sparkly outfits stand in formation facing a crowd.",
+    "last_image_desc": "Dancers in sparkly outfits perform energetic moves in front of crowd.",
+    "challenge": "Large motion",
+    "caption": "Dancers move energetically in coordinated steps before the audience."
+  },
+  {
+    "folder": "santa",
+    "first_image_desc": "Man in Santa suit with headphones raises right hand near Christmas tree.",
+    "last_image_desc": "Man in Santa suit with headphones raises left hand near Christmas tree.",
+    "challenge": "Large motion",
+    "caption": "Santa who is lost in the song, dances."
+  },
+  {
+    "folder": "schoolgirls",
+    "first_image_desc": "Four children in school uniforms stand near a wall and plants.",
+    "last_image_desc": "The tallest child steps forward while others remain near the wall.",
+    "challenge": "Large motion",
+    "caption": "A girl wearing a blue top walks to the right."
+  },
+  {
+    "folder": "scooter-black",
+    "first_image_desc": "A person on a black scooter rides on a city street.",
+    "last_image_desc": "The scooter rider moves leftward past parked cars and motorcycles.",
+    "challenge": "Linear motion",
+    "caption": "A person rides a scooter leftward along the street."
+  },
+  {
+    "folder": "scooter-board",
+    "first_image_desc": "Man rides a hoverboard kart toward the camera at an expo.",
+    "last_image_desc": "Man rides a hoverboard kart away from the camera on a carpeted floor.",
+    "challenge": "Large motion",
+    "caption": "Man rides a hoverboard kart forward across the expo floor."
+  },
+  {
+    "folder": "scooter-gray",
+    "first_image_desc": "A person on a scooter approaches a crosswalk near parked scooters.",
+    "last_image_desc": "The person on the scooter rides over the crosswalk past the building.",
+    "challenge": "Large motion",
+    "caption": "A person rides a scooter to the left."
+  },
+  {
+    "folder": "seasnake",
+    "first_image_desc": "A banded sea snake moves near seaweed on sandy ocean floor.",
+    "last_image_desc": "The banded sea snake has moved further right across the sandy floor.",
+    "challenge": "Large motion",
+    "caption": "A banded sea snake swims across the ocean floor."
+  },
+  {
+    "folder": "sheep",
+    "first_image_desc": "A sheep and three lambs stand near a tree in a field.",
+    "last_image_desc": "The sheep and lambs have moved slightly right away from the tree.",
+    "challenge": "Large motion",
+    "caption": "Sheep and lambs walk away from the tree in the field."
+  },
+  {
+    "folder": "shooting",
+    "first_image_desc": "Man in tactical gear holding a rifle and rope, facing forward.",
+    "last_image_desc": "Man in tactical gear holding a rifle and rope, turned to the left.",
+    "challenge": "Large motion",
+    "caption": "A man is shooting a gun while rappelling down a rope."
+  },
+  {
+    "folder": "skate-jump",
+    "first_image_desc": "A person skateboards toward a wooden picnic table.",
+    "last_image_desc": "The person skateboards under the picnic table from left to right.",
+    "challenge": "Occlusion",
+    "caption": "The skateboarder prepares to jump from behind the picnic table."
+  },
+  {
+    "folder": "skate-park",
+    "first_image_desc": "A person skateboards in a concrete skatepark bowl.",
+    "last_image_desc": "The skateboarder rides up the side of the skatepark bowl.",
+    "challenge": "Linear motion",
+    "caption": "A skateboarder rides rightward through the skatepark bowl."
+  },
+  {
+    "folder": "slackline",
+    "first_image_desc": "Person in midair above a slackline in a park.",
+    "last_image_desc": "Person upside down above a slackline in a park.",
+    "challenge": "Large motion",
+    "caption": "Person flips clockwise above the slackline."
+  },
+  {
+    "folder": "snowboard",
+    "first_image_desc": "Person snowboarding on a snowy slope facing left.",
+    "last_image_desc": "Person snowboarding with board turned and snow spraying up.",
+    "challenge": "Large motion",
+    "caption": "The snowboarder turns his body to the left while descending the slope."
+  },
+  {
+    "folder": "soapbox",
+    "first_image_desc": "A blue soapbox car approaches a wooden ramp on the street.",
+    "last_image_desc": "The blue soapbox car begins to ascend the wooden ramp.",
+    "challenge": "Large motion",
+    "caption": "The soapbox car climbs up the wooden ramp."
+  },
+  {
+    "folder": "soccer",
+    "first_image_desc": "Person in gray sweatshirt juggles soccer ball with right foot.",
+    "last_image_desc": "Person in gray sweatshirt juggles soccer ball with left foot.",
+    "challenge": "Large motion",
+    "caption": "Soccer ball is kicked upward by the person's foot."
+  },
+  {
+    "folder": "soccerball",
+    "first_image_desc": "A blue and white soccer ball near a tree trunk on grass.",
+    "last_image_desc": "A blue and white soccer ball farther left near another tree trunk.",
+    "challenge": "Large motion",
+    "caption": "A soccer ball rolls left behind the tree trunk."
+  },
+  {
+    "folder": "squirrel",
+    "first_image_desc": "A ground squirrel sits upright eating with its paws.",
+    "last_image_desc": "The ground squirrel raises its paws closer to its mouth.",
+    "challenge": "Near-static",
+    "caption": "The rodent is eating its food."
+  },
+  {
+    "folder": "stretch-girl",
+    "first_image_desc": "Woman in white sits cross-legged on grass with hands on knees.",
+    "last_image_desc": "Woman in white sits cross-legged with arms extended forward and hands clasped.",
+    "challenge": "Large motion",
+    "caption": "Woman extends her arms forward while sitting cross-legged on grass."
+  },
+  {
+    "folder": "stroller",
+    "first_image_desc": "Woman pushing a stroller with a child past a shop window.",
+    "last_image_desc": "Woman and stroller have moved further right along the shop window.",
+    "challenge": "Linear motion",
+    "caption": "Woman pushes stroller right past shop window."
+  },
+  {
+    "folder": "stunt",
+    "first_image_desc": "Person in blue shirt rides scooter up a ramp at skatepark.",
+    "last_image_desc": "Person in blue shirt rides scooter down the ramp at skatepark.",
+    "challenge": "Large motion",
+    "caption": "A person riding a scooter is riding down the slope."
+  },
+  {
+    "folder": "subway",
+    "first_image_desc": "Several people walking on a subway platform near a bench.",
+    "last_image_desc": "Different people walking on the subway platform near the bench.",
+    "challenge": "Occlusion",
+    "caption": "People walk past a bench on the subway platform."
+  },
+  {
+    "folder": "sunset",
+    "first_image_desc": "Sailboat on calm sea at sunset with large sun above horizon.",
+    "last_image_desc": "Sailboat on calm sea at sunset with sun slightly higher in sky.",
+    "challenge": "Linear motion",
+    "caption": "Sailboat moves right across the sea at sunset."
+  },
+  {
+    "folder": "sunset-girl",
+    "first_image_desc": "A woman stands on the beach at sunset holding a light.",
+    "last_image_desc": "A woman walks left on the beach at sunset holding a light.",
+    "challenge": "Linear motion",
+    "caption": "Woman walks right holding lights at sunset."
+  },
+  {
+    "folder": "sunset-walk",
+    "first_image_desc": "Person's legs entering from right on a rural path at sunset.",
+    "last_image_desc": "Person walking away from camera on a rural path at sunset.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward along the path toward the sunset."
+  },
+  {
+    "folder": "surf",
+    "first_image_desc": "A windsurfer with a green sail moves right on blue water.",
+    "last_image_desc": "A windsurfer with a green sail moves further right on blue water.",
+    "challenge": "Linear motion",
+    "caption": "Windsurfer sails rightward across the water."
+  },
+  {
+    "folder": "sweep",
+    "first_image_desc": "Red broom sweeping debris toward a red dustpan on wooden floor.",
+    "last_image_desc": "Red broom closer to dustpan with less debris on the floor.",
+    "challenge": "Large motion",
+    "caption": "Broom sweeps debris toward the dustpan on the floor."
+  },
+  {
+    "folder": "swing",
+    "first_image_desc": "Woman sitting still on a swing holding black object.",
+    "last_image_desc": "Woman leaning back swinging forward with legs extended.",
+    "challenge": "Large motion",
+    "caption": "Woman swings forward on a playground swing."
+  },
+  {
+    "folder": "tandem",
+    "first_image_desc": "Two people paragliding above a green valley with mountains in background.",
+    "last_image_desc": "Two people paragliding closer to a rocky hillside with mountains behind.",
+    "challenge": "Large motion",
+    "caption": "Two people paraglide forward above a mountainous landscape."
+  },
+  {
+    "folder": "tennis",
+    "first_image_desc": "Man in white shirt prepares to hit tennis ball on clay court.",
+    "last_image_desc": "Man in white shirt lunges low with racket on clay tennis court.",
+    "challenge": "Large motion",
+    "caption": "Man runs to the left and hits tennis ball with racket."
+  },
+  {
+    "folder": "tennis-vest",
+    "first_image_desc": "Man in athletic wear stands ready on a clay tennis court.",
+    "last_image_desc": "Man in athletic wear moves right with racket raised on tennis court.",
+    "challenge": "Large motion",
+    "caption": "Man moves to hit tennis ball with racket."
+  },
+  {
+    "folder": "tiger-tree",
+    "first_image_desc": "A tiger walking past a large tree branch.",
+    "last_image_desc": "The tiger has moved forward with its head closer to the branch.",
+    "challenge": "Large motion",
+    "caption": "A tiger walks forward past a fallen tree."
+  },
+  {
+    "folder": "tractor",
+    "first_image_desc": "A green tractor with trailer drives on a dirt road in sunlight.",
+    "last_image_desc": "The tractor and trailer have moved further right along the dirt road.",
+    "challenge": "Large motion",
+    "caption": "Tractor and trailer drive right on a dusty rural road."
+  },
+  {
+    "folder": "tractor-green",
+    "first_image_desc": "Tan off-road truck facing right on grassy dirt field.",
+    "last_image_desc": "Tan off-road truck has reversed toward a ditch on grassy dirt field.",
+    "challenge": "Large motion",
+    "caption": "The truck moves to the right on the grassy field."
+  },
+  {
+    "folder": "tractor-sand",
+    "first_image_desc": "A person drives a red tractor leftward on a sandy arena.",
+    "last_image_desc": "The tractor has moved further left behind a horse jump in the arena.",
+    "challenge": "Large motion",
+    "caption": "The tractor turns to avoid the obstacle."
+  },
+  {
+    "folder": "train",
+    "first_image_desc": "A blue model train and cars turning left on curved tracks.",
+    "last_image_desc": "The model train and cars have advanced further left on the tracks.",
+    "challenge": "Large motion",
+    "caption": "A blue model train moves forward along a curved track."
+  },
+  {
+    "folder": "train-snow",
+    "first_image_desc": "A train approaches on snowy tracks with a red signal light.",
+    "last_image_desc": "The train is closer on the snowy tracks with the red signal light.",
+    "challenge": "Large motion",
+    "caption": "A train moves forward through heavy falling snow."
+  },
+  {
+    "folder": "tuk-tuk",
+    "first_image_desc": "Three people sit together in an open vehicle.",
+    "last_image_desc": "Three people sit together as the girl lowers her arm.",
+    "challenge": "Occlusion",
+    "caption": "The girl on the far left points to the right with her hand."
+  },
+  {
+    "folder": "upside-down",
+    "first_image_desc": "Man and girl seated on amusement ride, man looking left.",
+    "last_image_desc": "Man and girl on ride, girl leaning back laughing.",
+    "challenge": "Large motion",
+    "caption": "Man and girl rotate forward on amusement park ride."
+  },
+  {
+    "folder": "varanus-cage",
+    "first_image_desc": "Lizard stands on a branch facing right in a terrarium.",
+    "last_image_desc": "Lizard stands on a branch facing left near a curved log.",
+    "challenge": "Large motion",
+    "caption": "Lizard walks to the left along the branch."
+  },
+  {
+    "folder": "walking",
+    "first_image_desc": "Man and woman walking on city sidewalk. Man looks at camera.",
+    "last_image_desc": "Man walks forward on sidewalk. Woman looks left, further behind.",
+    "challenge": "Large motion",
+    "caption": "Woman raises hand while walking behind man on sidewalk."
+  },
+  {
+    "folder": "woman-cry",
+    "first_image_desc": "Woman sitting on bed covering her face. Man sits behind her.",
+    "last_image_desc": "Woman remains seated covering her face. Man sits behind her holding phone.",
+    "challenge": "Near-static",
+    "caption": "Woman sits on bed covering her face with hands."
+  },
+  {
+    "folder": "worry",
+    "first_image_desc": "Man with hand on chin looking down and left.",
+    "last_image_desc": "Man with hand on chin looking down and slightly right.",
+    "challenge": "Near-static",
+    "caption": "Man turns his gaze to the right, lost in thought."
+  },
+  {
+    "folder": "writing",
+    "first_image_desc": "Person in black shirt writing with pencil next to laptop.",
+    "last_image_desc": "Person in black shirt writing with pencil next to laptop.",
+    "challenge": "Near-static",
+    "caption": "Person writes on paper next to an open laptop."
+  }
+]

65_dataset_caption.json

@@ -0,0 +1,1248 @@
+[
+  {
+    "folder": "dog-leg",
+    "first_image_desc": "Dog swimming underwater with front legs extended forward.",
+    "last_image_desc": "Dog swimming underwater with front legs bent underneath body.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog swims underwater moving its front legs backward."
+  },
+  {
+    "folder": "meerkat",
+    "first_image_desc": "Two meerkats facing right with both heads visible.",
+    "last_image_desc": "One meerkat left, the other mostly out of view to the right.",
+    "challenge": "Occlusion",
+    "caption": "Right meerkat moves out of view to the right."
+  },
+  {
+    "folder": "knife",
+    "first_image_desc": "Hand holds a knife above a head of napa cabbage.",
+    "last_image_desc": "Knife slices through napa cabbage held by a hand.",
+    "challenge": "Dynamic motion",
+    "caption": "Knife slices napa cabbage into thin strips."
+  },
+  {
+    "folder": "butterfly",
+    "first_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "last_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "challenge": "Near-static",
+    "caption": "Butterfly remains on the yellow marigold flower."
+  },
+  {
+    "folder": "person-hand",
+    "first_image_desc": "Person in white shirt and pants with arm at side.",
+    "last_image_desc": "Person in white shirt and pants with arm extended forward.",
+    "challenge": "Linear motion",
+    "caption": "Person extends hand forward."
+  },
+  {
+    "folder": "elephant-apple",
+    "first_image_desc": "Man holds apple near elephant with trunk raised by water.",
+    "last_image_desc": "Man raises apple higher as elephant opens mouth wide.",
+    "challenge": "Dynamic motion",
+    "caption": "Man lifts apple as elephant opens mouth wide."
+  },
+  {
+    "folder": "person-sunset",
+    "first_image_desc": "Person in water facing sunset with hands down.",
+    "last_image_desc": "Person in water facing sunset with both hands on head.",
+    "challenge": "Dynamic motion",
+    "caption": "Person raises both hands to head in the water."
+  },
+  {
+    "folder": "child-run",
+    "first_image_desc": "A child in blue and red runs on a dirt path in a field.",
+    "last_image_desc": "The child is farther along the dirt path in the field.",
+    "challenge": "Linear motion",
+    "caption": "A child runs forward along a dirt path in the field."
+  },
+  {
+    "folder": "wood-shave",
+    "first_image_desc": "Person holds a hand planer at the edge of a wooden board.",
+    "last_image_desc": "Person pushes the hand planer further along the wooden board.",
+    "challenge": "Linear motion",
+    "caption": "Hand planer moves forward along the edge of the wood."
+  },
+  {
+    "folder": "run-smoke",
+    "first_image_desc": "Two people run on sand with purple smoke in the air.",
+    "last_image_desc": "Two people run on sand with purple smoke trailing behind.",
+    "challenge": "Dynamic motion",
+    "caption": "Two people run forward holding a purple smoke flare."
+  },
+  {
+    "folder": "woman-arm",
+    "first_image_desc": "Woman in blue dress facing camera with arms outstretched in field.",
+    "last_image_desc": "Woman in blue dress facing away walking into field toward trees.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman turns and walks away across grassy field."
+  },
+  {
+    "folder": "kangaroo",
+    "first_image_desc": "A kangaroo stands on grass with its head turned left.",
+    "last_image_desc": "The kangaroo stands on grass with its head turned toward the camera.",
+    "challenge": "Dynamic motion",
+    "caption": "Kangaroo turns its head from left to face forward."
+  },
+  {
+    "folder": "surfer",
+    "first_image_desc": "Two surfers holding boards run toward the ocean on wet sand.",
+    "last_image_desc": "Two surfers run closer to the water with boards in hand.",
+    "challenge": "Dynamic motion",
+    "caption": "Two surfers run toward the ocean carrying surfboards."
+  },
+  {
+    "folder": "jog-tree",
+    "first_image_desc": "Person jogging away on a leaf-covered forest path.",
+    "last_image_desc": "Person farther down the same forest path among autumn trees.",
+    "challenge": "Linear motion",
+    "caption": "Person jogs away along the tree-lined path."
+  },
+  {
+    "folder": "walk-snow",
+    "first_image_desc": "Two people walk away on a snowy forest path.",
+    "last_image_desc": "Two people farther along the snowy path in the forest.",
+    "challenge": "Dynamic motion",
+    "caption": "Two people walk away on a snowy forest path."
+  },
+  {
+    "folder": "goat-grass",
+    "first_image_desc": "A goat stands on grass facing away.",
+    "last_image_desc": "The goat stands on grass looking to the left.",
+    "challenge": "Dynamic motion",
+    "caption": "The goat turns its head to the left."
+  },
+  {
+    "folder": "rooster",
+    "first_image_desc": "A rooster stands on a branch with head turned left.",
+    "last_image_desc": "The rooster stands on the branch facing forward.",
+    "challenge": "Linear motion",
+    "caption": "The rooster turns its head from left to forward."
+  },
+  {
+    "folder": "suv-road",
+    "first_image_desc": "A black SUV enters from the left on a dirt road.",
+    "last_image_desc": "The black SUV drives further right on the dirt road.",
+    "challenge": "Dynamic motion",
+    "caption": "A black SUV drives rightward along a dirt road."
+  },
+  {
+    "folder": "dog-grass",
+    "first_image_desc": "A dog stands in tall green grass facing forward.",
+    "last_image_desc": "The dog jumps forward through the tall grass.",
+    "challenge": "Dynamic motion",
+    "caption": "A dog leaps forward through tall grass."
+  },
+  {
+    "folder": "curly-hair",
+    "first_image_desc": "Person with curly hair sits as another applies makeup.",
+    "last_image_desc": "Person with curly hair sits as another applies makeup near lips.",
+    "challenge": "Occlusion",
+    "caption": "Two people are doing the makeup and hair of a person with curly hair."
+  },
+  {
+    "folder": "car-highway",
+    "first_image_desc": "Red and white cars drive toward camera on multi-lane highway.",
+    "last_image_desc": "Red car is much closer to camera with more cars behind it.",
+    "challenge": "Dynamic motion",
+    "caption": "Red car moves forward along the highway."
+  },
+  {
+    "folder": "hummingbird",
+    "first_image_desc": "A hummingbird hovers near pink flowers with wings blurred.",
+    "last_image_desc": "The hummingbird faces downward beneath the pink flowers.",
+    "challenge": "Dynamic motion",
+    "caption": "Hummingbird moves downward beneath the pink flowers."
+  },
+  {
+    "folder": "duckling",
+    "first_image_desc": "Yellow duckling sitting upright on grass facing left.",
+    "last_image_desc": "Yellow duckling with head down and body facing forward.",
+    "challenge": "Dynamic motion",
+    "caption": "Duckling lowers its head toward the ground."
+  },
+  {
+    "folder": "skateboard",
+    "first_image_desc": "Person on skateboard facing left in sunlight.",
+    "last_image_desc": "Person on skateboard facing left with bent knees.",
+    "challenge": "Dynamic motion",
+    "caption": "Person rides skateboard on open pavement."
+  },
+  {
+    "folder": "woman-exercise",
+    "first_image_desc": "Woman in pink workout clothes lifts right knee indoors.",
+    "last_image_desc": "Woman in pink workout clothes lifts left knee indoors.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman alternates lifting knees during indoor exercise."
+  },
+  {
+    "folder": "walk-bench",
+    "first_image_desc": "A person walks on a path near a bench at sunrise.",
+    "last_image_desc": "The person is farther left on the path near the bench at sunrise.",
+    "challenge": "Linear motion",
+    "caption": "A person walks along a path at sunrise."
+  },
+  {
+    "folder": "dog-frisbee",
+    "first_image_desc": "Two dogs chase an orange frisbee near the shoreline.",
+    "last_image_desc": "Two dogs stand together at the water's edge with the frisbee.",
+    "challenge": "Dynamic motion",
+    "caption": "Two dogs run and catch a frisbee by the ocean."
+  },
+  {
+    "folder": "cyclist-road",
+    "first_image_desc": "A cyclist is on the left side of a rural road.",
+    "last_image_desc": "The cyclist is centered and closer on the rural road.",
+    "challenge": "Dynamic motion",
+    "caption": "A cyclist moves forward along a country road."
+  },
+  {
+    "folder": "dog-soccer",
+    "first_image_desc": "A black and white dog runs toward a soccer ball on sand.",
+    "last_image_desc": "The dog runs left with the soccer ball in its mouth.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog runs left and picks up soccer ball on sand."
+  },
+  {
+    "folder": "penguin",
+    "first_image_desc": "Penguin stands on rocky ground with head upright.",
+    "last_image_desc": "Penguin stands on rocky ground with head turned and beak under wing.",
+    "challenge": "Dynamic motion",
+    "caption": "Penguin lowers head and tucks beak under wing."
+  },
+  {
+    "folder": "man-lake",
+    "first_image_desc": "Person about to jump off a dock into a lake.",
+    "last_image_desc": "Ripples in the water where the person landed. No person visible.",
+    "challenge": "Dynamic motion",
+    "caption": "A person jumps off the dock into the lake."
+  },
+  {
+    "folder": "burger",
+    "first_image_desc": "Open sandwich bun with vegetables on a black tray.",
+    "last_image_desc": "Cooked burger patty placed on top of the vegetables on bun.",
+    "challenge": "Occlusion",
+    "caption": "Burger patty placed onto vegetables on sandwich bun."
+  },
+  {
+    "folder": "children-dance",
+    "first_image_desc": "A boy and girl face each other holding hands outdoors.",
+    "last_image_desc": "The boy and girl have turned with their backs partially to the viewer.",
+    "challenge": "Occlusion",
+    "caption": "Two children turn together while dancing outside."
+  },
+  {
+    "folder": "woman-rocky",
+    "first_image_desc": "Woman standing on rocky ground with arm bent and lowered.",
+    "last_image_desc": "Woman standing on rocky ground with arm raised upward.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman raises her right arm while stretching outdoors."
+  },
+  {
+    "folder": "parrot",
+    "first_image_desc": "Red parrot facing left with head turned to the side.",
+    "last_image_desc": "Red parrot facing forward with beak pointing straight ahead.",
+    "challenge": "Linear motion",
+    "caption": "Parrot turns head from left to forward."
+  },
+  {
+    "folder": "wakeboarder",
+    "first_image_desc": "Person wakeboarding on water near a white fence.",
+    "last_image_desc": "Person wakeboarding farther right with water spray behind.",
+    "challenge": "Linear motion",
+    "caption": "Wakeboarder moves quickly to the right across the water."
+  },
+  {
+    "folder": "dog-park",
+    "first_image_desc": "A small black and white dog stands on grass far from the camera.",
+    "last_image_desc": "The dog is much closer to the camera on the grass.",
+    "challenge": "Dynamic motion",
+    "caption": "A dog runs toward the camera across the grass."
+  },
+  {
+    "folder": "woman-hand",
+    "first_image_desc": "Woman in black top raises right hand under red and green lighting.",
+    "last_image_desc": "Woman lifts both hands to her hair under red and green lighting.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman lifts hands to her hair."
+  },
+  {
+    "folder": "lion-yawn",
+    "first_image_desc": "A lioness yawns with mouth wide open beside another lioness.",
+    "last_image_desc": "The lioness closes her mouth after yawning beside the other lioness.",
+    "challenge": "Dynamic motion",
+    "caption": "Lioness closes mouth after a wide yawn."
+  },
+  {
+    "folder": "cyclist-four",
+    "first_image_desc": "Three cyclists ride away on a tree-lined path.",
+    "last_image_desc": "One cyclist rides away alone on the same path.",
+    "challenge": "Occlusion",
+    "caption": "Two cyclists move farther ahead on the path."
+  },
+  {
+    "folder": "husky",
+    "first_image_desc": "A husky stands on grass with mountains and trees behind.",
+    "last_image_desc": "The husky lies down on the grass with head lowered.",
+    "challenge": "Dynamic motion",
+    "caption": "The husky lies down on the grassy field."
+  },
+  {
+    "folder": "smile-boy",
+    "first_image_desc": "Smiling boy in orange shirt riding bicycle outdoors.",
+    "last_image_desc": "Smiling boy in orange shirt cycling past person in background.",
+    "challenge": "Dynamic motion",
+    "caption": "Boy rides bicycle past people in park."
+  },
+  {
+    "folder": "city",
+    "first_image_desc": "Blurry city skyline and beach with no people visible in foreground.",
+    "last_image_desc": "Woman holding camera up to face overlooking city skyline and beach.",
+    "challenge": "Occlusion",
+    "caption": "Woman lifts camera to take photo of city skyline."
+  },
+  {
+    "folder": "silver-car",
+    "first_image_desc": "Front of a silver car entering a railroad crossing.",
+    "last_image_desc": "Rear of the silver car leaving the railroad crossing.",
+    "challenge": "Linear motion",
+    "caption": "Silver car drives across the railroad crossing."
+  },
+  {
+    "folder": "salad",
+    "first_image_desc": "Hands hold two spoons above a bowl of fruit salad.",
+    "last_image_desc": "Spoons are raised above the bowl with fruit lifted out.",
+    "challenge": "Dynamic motion",
+    "caption": "Spoons lift fruit salad out of the bowl."
+  },
+  {
+    "folder": "hand-water",
+    "first_image_desc": "Hands apart under running water.",
+    "last_image_desc": "Hands clasped together under running water.",
+    "challenge": "Dynamic motion",
+    "caption": "Hands move together and clasp under running water."
+  },
+  {
+    "folder": "aerobatics",
+    "first_image_desc": "Person in sunglasses and hat flying a glider over fields.",
+    "last_image_desc": "Person in glider with blue straps, sky and clouds outside.",
+    "challenge": "Large motion",
+    "caption": "Glider floats over fields with man holding control stick."
+  },
+  {
+    "folder": "air-conditioner",
+    "first_image_desc": "Remote control shows 21°C near an air conditioner.",
+    "last_image_desc": "Remote control shows 26°C near the same air conditioner.",
+    "challenge": "Near-static",
+    "caption": "Remote control temperature increases from 21°C to 26°C."
+  },
+  {
+    "folder": "baby-duck",
+    "first_image_desc": "Duckling swimming on water facing left with an insect ahead.",
+    "last_image_desc": "Duckling swimming on water facing left with beak open near insect.",
+    "challenge": "Large motion",
+    "caption": "Duckling swims left and dips head into the water."
+  },
+  {
+    "folder": "beach-ball",
+    "first_image_desc": "Man with red ball and dog near water, girl on sand.",
+    "last_image_desc": "Girl holds red ball on sand, man and dog near water.",
+    "challenge": "Large motion",
+    "caption": "Woman catches ball thrown by man on the beach."
+  },
+  {
+    "folder": "beach-metal",
+    "first_image_desc": "Person with metal detector walking on sandy beach near ocean.",
+    "last_image_desc": "Person stands on beach holding metal detector facing ocean waves.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward on the beach with a metal detector."
+  },
+  {
+    "folder": "bear",
+    "first_image_desc": "A brown bear walks left among large rocks and dirt.",
+    "last_image_desc": "The brown bear steps forward with head lowered near a log.",
+    "challenge": "Large motion",
+    "caption": "The brown bear walks left and steps onto a rock."
+  },
+  {
+    "folder": "bench-swing",
+    "first_image_desc": "Empty wooden porch swing angled left among flowers and greenery.",
+    "last_image_desc": "Empty wooden porch swing angled right among flowers and greenery.",
+    "challenge": "Large motion",
+    "caption": "The swing swings back and forth."
+  },
+  {
+    "folder": "bike-packing",
+    "first_image_desc": "Person in cycling kit bends over bicycle with front wheel upright.",
+    "last_image_desc": "Person in cycling kit bends over bicycle with front wheel turned left.",
+    "challenge": "Large motion",
+    "caption": "Cyclist rotates bicycle front wheel to the left."
+  },
+  {
+    "folder": "bird",
+    "first_image_desc": "White cockatoo perched on a branch with wings spread upward.",
+    "last_image_desc": "White cockatoo perched on a branch with wings folded at its sides.",
+    "challenge": "Large motion",
+    "caption": "The white parrot repeatedly lowers and raises its body on the tree branch."
+  },
+  {
+    "folder": "bird-tail",
+    "first_image_desc": "Small brown bird on mossy branch with wings raised and spread.",
+    "last_image_desc": "Small brown bird on mossy branch with wings lowered and spread.",
+    "challenge": "Large motion",
+    "caption": "Bird is dancing, flapping its wings and shaking its tail feathers."
+  },
+  {
+    "folder": "bmx-bumps",
+    "first_image_desc": "Person in helmet rides BMX bike on dirt track.",
+    "last_image_desc": "Person in black gear blocks view on left side.",
+    "challenge": "Occlusion",
+    "caption": "The rider passes behind another person while cycling on bumpy terrain."
+  },
+  {
+    "folder": "bmx-trees",
+    "first_image_desc": "Boy riding a bicycle past a colorful mural wall.",
+    "last_image_desc": "Boy on bicycle approaching a path near grass and trees.",
+    "challenge": "Large motion",
+    "caption": "Boy rides bicycle along mural wall toward a park path."
+  },
+  {
+    "folder": "boat",
+    "first_image_desc": "A white fishing boat moves left on calm blue water.",
+    "last_image_desc": "The fishing boat is farther left with a wake behind it.",
+    "challenge": "Linear motion",
+    "caption": "A fishing boat moves left across the water."
+  },
+  {
+    "folder": "book",
+    "first_image_desc": "Open book on sand with blank pages facing up.",
+    "last_image_desc": "Open book on sand with pages partially lifted and turned.",
+    "challenge": "Large motion",
+    "caption": "Book pages flip upward in the wind."
+  },
+  {
+    "folder": "bowl",
+    "first_image_desc": "Hand holds a mallet above a brass singing bowl in snowy outdoors.",
+    "last_image_desc": "Hand holds a mallet resting vertically inside a brass singing bowl.",
+    "challenge": "Large motion",
+    "caption": "The mallet sweeps counterclockwise around the brass singing bowl."
+  },
+  {
+    "folder": "boxing-fisheye",
+    "first_image_desc": "Two boxers and a referee stand in a ring outdoors at dusk.",
+    "last_image_desc": "Boxer in blue headgear ducks left as opponent stands near ropes.",
+    "challenge": "Large motion",
+    "caption": "Boxers are punching toward each other."
+  },
+  {
+    "folder": "boy-bike",
+    "first_image_desc": "A boy rides a bicycle on a rural road.",
+    "last_image_desc": "The boy on the bicycle is much closer and smiling.",
+    "challenge": "Linear motion",
+    "caption": "A boy rides a bicycle forward along the road."
+  },
+  {
+    "folder": "breakdance",
+    "first_image_desc": "Breakdancer balances on one hand with legs extended upward.",
+    "last_image_desc": "Breakdancer is mid-air with body horizontal and legs bent.",
+    "challenge": "Large motion",
+    "caption": "Breakdancer spins on one hand during street performance."
+  },
+  {
+    "folder": "breakdance-flare",
+    "first_image_desc": "Person balances on one hand with one leg raised vertically.",
+    "last_image_desc": "Person balances on one hand with legs extended horizontally.",
+    "challenge": "Large motion",
+    "caption": "Person performs a one-handed breakdance move on the ground."
+  },
+  {
+    "folder": "brown-sheep",
+    "first_image_desc": "A brown goat stands on grass facing left.",
+    "last_image_desc": "A brown goat lowers its head to graze on grass.",
+    "challenge": "Large motion",
+    "caption": "Goat lowers its head toward the ground."
+  },
+  {
+    "folder": "bus",
+    "first_image_desc": "A white and blue bus approaches a bus stop on a city street.",
+    "last_image_desc": "The bus moves past trees and construction barriers along the street.",
+    "challenge": "Linear motion",
+    "caption": "A city bus moves forward along the street."
+  },
+  {
+    "folder": "camel",
+    "first_image_desc": "A camel stands near a wooden fence facing right.",
+    "last_image_desc": "A camel walks away from the fence as another camel approaches.",
+    "challenge": "Occlusion",
+    "caption": "A camel walks away as another camel approaches from behind."
+  },
+  {
+    "folder": "camel-white",
+    "first_image_desc": "A white two-humped camel stands on grass facing right.",
+    "last_image_desc": "The camel has walked right and is closer to a wooden building.",
+    "challenge": "Linear motion",
+    "caption": "A camel walks to the right."
+  },
+  {
+    "folder": "car-roundabout",
+    "first_image_desc": "Gray SUV turning left at a roundabout in a city.",
+    "last_image_desc": "Gray SUV driving away from the roundabout on a city street.",
+    "challenge": "Large motion",
+    "caption": "A gray car is circling the roundabout."
+  },
+  {
+    "folder": "car-turn",
+    "first_image_desc": "A silver SUV is driving on a mountain road approaching a curve.",
+    "last_image_desc": "The silver SUV is further along the road near the left edge.",
+    "challenge": "Large motion",
+    "caption": "SUV drives forward along the winding mountain road."
+  },
+  {
+    "folder": "carousel",
+    "first_image_desc": "Painted horse swings hang around a blue pole on gravel.",
+    "last_image_desc": "Painted horse swings have rotated around the blue pole on gravel.",
+    "challenge": "Large motion",
+    "caption": "Horse swings rotate counterclockwise around the blue pole."
+  },
+  {
+    "folder": "cat-girl",
+    "first_image_desc": "Girl holding a kitten close to her face outdoors.",
+    "last_image_desc": "Girl holding a kitten against her head facing downward.",
+    "challenge": "Large motion",
+    "caption": "Girl lifts kitten upward in front of her."
+  },
+  {
+    "folder": "cats-car",
+    "first_image_desc": "Two children sit in a toy car holding kittens outdoors.",
+    "last_image_desc": "One child leans forward petting a kitten in the toy car.",
+    "challenge": "Large motion",
+    "caption": "Two children are laughing as they lift the cats."
+  },
+  {
+    "folder": "chamaleon",
+    "first_image_desc": "A green lizard stretches forward on a branch among leaves.",
+    "last_image_desc": "A green lizard crouches lower on the branch among leaves.",
+    "challenge": "Large motion",
+    "caption": "The lizard is slowly moving its front legs."
+  },
+  {
+    "folder": "color-run",
+    "first_image_desc": "People in orange and white shirts with green hands in foreground.",
+    "last_image_desc": "Green hands nearly cover the view of a person in white shirt.",
+    "challenge": "Occlusion",
+    "caption": "Green hands move upward blocking the view of runners."
+  },
+  {
+    "folder": "cook",
+    "first_image_desc": "A person holds a knife above an apple tart.",
+    "last_image_desc": "A person lifts a slice of apple tart with a knife.",
+    "challenge": "Large motion",
+    "caption": "A slice of apple tart is lifted onto a plate."
+  },
+  {
+    "folder": "cows",
+    "first_image_desc": "A brown and white cow stands on a dirt path facing right.",
+    "last_image_desc": "The cow has walked further right along the dirt path.",
+    "challenge": "Linear motion",
+    "caption": "A cow walks right along a dirt path."
+  },
+  {
+    "folder": "dance-twirl",
+    "first_image_desc": "A woman in a blue dress dances outdoors before a seated crowd.",
+    "last_image_desc": "The woman in a blue dress dances with her arm raised near the crowd.",
+    "challenge": "Large motion",
+    "caption": "A woman in a blue dress performs a dance outdoors."
+  },
+  {
+    "folder": "deer",
+    "first_image_desc": "Two deer facing each other on snowy ground under trees.",
+    "last_image_desc": "Two deer with heads down close together under snowy trees.",
+    "challenge": "Large motion",
+    "caption": "Two deer butt heads."
+  },
+  {
+    "folder": "desert-camel",
+    "first_image_desc": "Two people and two camels walking on a sand dune at sunset.",
+    "last_image_desc": "Two people and two camels further right on the sand dune at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Two men lead camels across the desert at sunset."
+  },
+  {
+    "folder": "disc-jockey",
+    "first_image_desc": "Tattooed man stands beside masked person in hooded outfit.",
+    "last_image_desc": "Tattooed man and masked person both raise arms upward.",
+    "challenge": "Large motion",
+    "caption": "Tattooed man raises both arms upward beside masked person."
+  },
+  {
+    "folder": "dog-bark",
+    "first_image_desc": "A Doberman with closed mouth looks upward on a leash.",
+    "last_image_desc": "A Doberman with mouth wide open looks upward on a leash.",
+    "challenge": "Large motion",
+    "caption": "Doberman barks, showing its teeth."
+  },
+  {
+    "folder": "dog-beach",
+    "first_image_desc": "A black and brown dog runs on a sandy beach.",
+    "last_image_desc": "The dog continues running on the beach with raised front legs.",
+    "challenge": "Large motion",
+    "caption": "The dog runs quickly to the left across the sandy beach."
+  },
+  {
+    "folder": "dog-gooses",
+    "first_image_desc": "A black and white dog faces a group of ducks on grass.",
+    "last_image_desc": "The dog is now on the right side facing the ducks on grass.",
+    "challenge": "Large motion",
+    "caption": "The dog chases the ducks across the grassy field."
+  },
+  {
+    "folder": "dog-snow",
+    "first_image_desc": "Brown dog facing forward in falling snow.",
+    "last_image_desc": "Brown dog turning head to the left in falling snow.",
+    "challenge": "Near-static",
+    "caption": "Dog turns its head left in the snow."
+  },
+  {
+    "folder": "dog-swim",
+    "first_image_desc": "A golden retriever splashes in shallow water facing right.",
+    "last_image_desc": "The golden retriever runs leftward through shallow water.",
+    "challenge": "Large motion",
+    "caption": "Dog runs through shallow water toward the viewer."
+  },
+  {
+    "folder": "dog-water",
+    "first_image_desc": "A black and white dog lies behind a white bowl on the floor.",
+    "last_image_desc": "The dog stands with its nose in the white bowl on the floor.",
+    "challenge": "Large motion",
+    "caption": "Dog walks forward and puts nose into the bowl."
+  },
+  {
+    "folder": "dogs-jump",
+    "first_image_desc": "Woman in yellow stands with two dogs on grassy field.",
+    "last_image_desc": "Woman stands as two dogs move away on grassy field.",
+    "challenge": "Large motion",
+    "caption": "Two dogs jump and run around beside the woman."
+  },
+  {
+    "folder": "dogs-scale",
+    "first_image_desc": "A hand holds a small puppy near a pink kitchen scale.",
+    "last_image_desc": "The puppy stands on the scale with another puppy nearby.",
+    "challenge": "Large motion",
+    "caption": "A puppy is placed onto the kitchen scale."
+  },
+  {
+    "folder": "drone",
+    "first_image_desc": "Two men stand at a booth with electronics and drones on display.",
+    "last_image_desc": "Man holding a phone and a small drone walks away from the booth.",
+    "challenge": "Large motion",
+    "caption": "Man picks up drone from floor and holds it up."
+  },
+  {
+    "folder": "drum",
+    "first_image_desc": "Man in headphones playing drums with right arm raised.",
+    "last_image_desc": "Man in headphones playing drums with both arms lowered.",
+    "challenge": "Large motion",
+    "caption": "Drummer is passionately playing the drums."
+  },
+  {
+    "folder": "elephant",
+    "first_image_desc": "An elephant stands on a dusty path near rocks and trees.",
+    "last_image_desc": "The elephant has walked further right along the dusty path.",
+    "challenge": "Linear motion",
+    "caption": "An elephant walks right through a dusty enclosure."
+  },
+  {
+    "folder": "flamingo",
+    "first_image_desc": "A flamingo stands in shallow water with its head raised.",
+    "last_image_desc": "The flamingo lowers its head to the water to feed.",
+    "challenge": "Large motion",
+    "caption": "A flamingo lowers its head toward the water."
+  },
+  {
+    "folder": "four-walking",
+    "first_image_desc": "Four women in white walk toward the camera on a cobblestone street.",
+    "last_image_desc": "Four women in white are much closer to the camera on the street.",
+    "challenge": "Large motion",
+    "caption": "Four women in white walk forward on a cobblestone street."
+  },
+  {
+    "folder": "frog",
+    "first_image_desc": "A green frog sits on rocky ground facing left.",
+    "last_image_desc": "The green frog remains on the rocky ground in the same position.",
+    "challenge": "Near-static",
+    "caption": "The frog stays still on the rocky ground."
+  },
+  {
+    "folder": "gazelle",
+    "first_image_desc": "A gazelle is lying on the ground with mouth slightly open.",
+    "last_image_desc": "The gazelle remains lying with mouth more widely open.",
+    "challenge": "Near-static",
+    "caption": "The gazelle is chewing something."
+  },
+  {
+    "folder": "giant-slalom",
+    "first_image_desc": "A skier in red suit and blue helmet descends a snowy slope.",
+    "last_image_desc": "Only the skier's head and arm are visible behind a snowbank.",
+    "challenge": "Occlusion",
+    "caption": "Skier disappears behind slope and reappears further right."
+  },
+  {
+    "folder": "girl-dog",
+    "first_image_desc": "Girl in wheelchair and dog moving along a paved path.",
+    "last_image_desc": "Girl in wheelchair and dog farther along the path near a bench.",
+    "challenge": "Large motion",
+    "caption": "Girl in wheelchair and dog move forward along the path."
+  },
+  {
+    "folder": "girl-happy",
+    "first_image_desc": "Woman in white shirt smiling with arms outstretched looking right.",
+    "last_image_desc": "Woman in white shirt smiling with arms outstretched looking left.",
+    "challenge": "Large motion",
+    "caption": "Woman turns head from right to left while smiling."
+  },
+  {
+    "folder": "girl-music",
+    "first_image_desc": "Person with closed eyes holds headphones with both hands.",
+    "last_image_desc": "Person with closed eyes holds headphones and tilts head downward.",
+    "challenge": "Large motion",
+    "caption": "The woman is shaking her head to the rhythm."
+  },
+  {
+    "folder": "girl-smile",
+    "first_image_desc": "Girl in black jacket touches hair with both hands, smiling.",
+    "last_image_desc": "Girl in black jacket smiles with hands lowered, hair neat.",
+    "challenge": "Large motion",
+    "caption": "Girl lowers hands from head and smiles."
+  },
+  {
+    "folder": "girl-turn",
+    "first_image_desc": "Girl in yellow dress faces forward holding skirt sides.",
+    "last_image_desc": "Girl in yellow dress turns to her left smiling.",
+    "challenge": "Large motion",
+    "caption": "Girl spins clockwise."
+  },
+  {
+    "folder": "goat",
+    "first_image_desc": "A goat stands on rocky terrain facing away.",
+    "last_image_desc": "The goat stands on rocks facing slightly more to the right.",
+    "challenge": "Large motion",
+    "caption": "A goat turns right on rocky mountain terrain."
+  },
+  {
+    "folder": "goat-branch",
+    "first_image_desc": "A brown goat stands under a horizontal tree branch.",
+    "last_image_desc": "The brown goat stands with its head further forward under the branch.",
+    "challenge": "Near-static",
+    "caption": "A goat is rubbing its back against a tree branch."
+  },
+  {
+    "folder": "gold-fish",
+    "first_image_desc": "Several goldfish swim near a branch and green plants in an aquarium.",
+    "last_image_desc": "Goldfish have moved upward and right, one fish now above the others.",
+    "challenge": "Large motion",
+    "caption": "Goldfish swim slowly in a blue-lit aquarium."
+  },
+  {
+    "folder": "golf",
+    "first_image_desc": "Person walking toward a white golf cart on grass.",
+    "last_image_desc": "Person sitting inside the white golf cart on grass.",
+    "challenge": "Large motion",
+    "caption": "After a person gets into the car, it moves forward."
+  },
+  {
+    "folder": "gorilla",
+    "first_image_desc": "Adult and young gorilla sitting among green leaves.",
+    "last_image_desc": "Adult gorilla and young gorilla sitting with leaves in foreground.",
+    "challenge": "Occlusion",
+    "caption": "Young gorilla moves behind leaves beside adult gorilla."
+  },
+  {
+    "folder": "gym-pull",
+    "first_image_desc": "Man sits on gym machine holding bar above head with arms extended.",
+    "last_image_desc": "Man sits on gym machine pulling bar down to chest with bent arms.",
+    "challenge": "Large motion",
+    "caption": "Man pulls lat pulldown bar from overhead to chest."
+  },
+  {
+    "folder": "gym-wave",
+    "first_image_desc": "Man in white shirt and shorts holding battle ropes indoors.",
+    "last_image_desc": "Man in white shirt and shorts swinging battle ropes upward.",
+    "challenge": "Large motion",
+    "caption": "A man swings a battle rope at the gym."
+  },
+  {
+    "folder": "hike",
+    "first_image_desc": "Man with backpack walking on rocky mountain trail.",
+    "last_image_desc": "Man with backpack standing on rocky mountain trail.",
+    "challenge": "Linear motion",
+    "caption": "Man walks along a rocky mountain trail."
+  },
+  {
+    "folder": "hike-man",
+    "first_image_desc": "Person with backpack walks on a forest path in sunlight.",
+    "last_image_desc": "Person with backpack farther along the same sunlit forest path.",
+    "challenge": "Linear motion",
+    "caption": "A person walks forward along a forest path."
+  },
+  {
+    "folder": "hockey",
+    "first_image_desc": "Man on rollerblades with hockey stick near small net and ball.",
+    "last_image_desc": "Man on rollerblades swings hockey stick at yellow ball on ground.",
+    "challenge": "Large motion",
+    "caption": "Man on rollerblades moves forward and hits yellow ball."
+  },
+  {
+    "folder": "hoverboard",
+    "first_image_desc": "Person on a hoverboard facing forward on a wet path.",
+    "last_image_desc": "Person on a hoverboard turning away on the wet path.",
+    "challenge": "Large motion",
+    "caption": "Person rides a hoverboard forward."
+  },
+  {
+    "folder": "india",
+    "first_image_desc": "Several people walk and ride scooters on a sunlit street.",
+    "last_image_desc": "A person in a plaid shirt blocks much of the view of the street.",
+    "challenge": "Occlusion",
+    "caption": "A person in plaid shirt moves across a busy street scene."
+  },
+  {
+    "folder": "kid-football",
+    "first_image_desc": "Boy in orange jersey and red cap faces soccer ball in air.",
+    "last_image_desc": "Boy in orange jersey and red cap stands near soccer ball on field.",
+    "challenge": "Large motion",
+    "caption": "Boy is performing a soccer ball kick-up."
+  },
+  {
+    "folder": "kite-walk",
+    "first_image_desc": "Person in wetsuit and helmet holding kiteboard on sandy beach.",
+    "last_image_desc": "Person in wetsuit and helmet holding kiteboard partially blocked by pole.",
+    "challenge": "Occlusion",
+    "caption": "Kiteboarder walks backward along the sandy beach."
+  },
+  {
+    "folder": "koala",
+    "first_image_desc": "A koala climbs horizontally on a tree branch.",
+    "last_image_desc": "The koala is mostly hidden behind a vertical tree trunk.",
+    "challenge": "Occlusion",
+    "caption": "Koala climbs right and head disappears behind tree branch."
+  },
+  {
+    "folder": "lady-running",
+    "first_image_desc": "Elderly woman in colorful shirt walks away from camera in dining area.",
+    "last_image_desc": "Elderly woman in colorful shirt stands near table with seated people.",
+    "challenge": "Large motion",
+    "caption": "Elderly woman runs toward a table with other seated people."
+  },
+  {
+    "folder": "lindy-hop",
+    "first_image_desc": "Several couples are swing dancing in a hall with wooden floors.",
+    "last_image_desc": "A couple dances in the foreground while others dance in the background.",
+    "challenge": "Large motion",
+    "caption": "People swing dance across the hall in rotating pairs."
+  },
+  {
+    "folder": "lucia",
+    "first_image_desc": "Woman in black dress walks on path with grass and trees.",
+    "last_image_desc": "Woman in black dress approaches a wooden bench on the path.",
+    "challenge": "Occlusion",
+    "caption": "Woman walks toward a bench on a sunny path."
+  },
+  {
+    "folder": "makeup",
+    "first_image_desc": "A hand applies makeup to a woman's closed eyelid.",
+    "last_image_desc": "A hand partially covers a woman's face as she keeps her eyes closed.",
+    "challenge": "Large motion",
+    "caption": "The woman opens her eyes while having her eye makeup applied."
+  },
+  {
+    "folder": "mallard-fly",
+    "first_image_desc": "Duck standing on green grass near a flowing river.",
+    "last_image_desc": "Duck flying above a sunlit riverbank with other ducks below.",
+    "challenge": "Large motion",
+    "caption": "Duck takes off from grass and flies over the riverbank."
+  },
+  {
+    "folder": "mallard-water",
+    "first_image_desc": "A brown duck swims leftward on rippling water.",
+    "last_image_desc": "The brown duck faces forward on the water.",
+    "challenge": "Large motion",
+    "caption": "Duck turns to face forward on the pond."
+  },
+  {
+    "folder": "man",
+    "first_image_desc": "Man in blue shirt looking forward with neutral expression.",
+    "last_image_desc": "Man in blue shirt looking forward with one eye partly closed.",
+    "challenge": "Occlusion",
+    "caption": "Man raises hand to rub his eye."
+  },
+  {
+    "folder": "man-bike",
+    "first_image_desc": "Man riding motorcycle with arms outstretched in sunlight.",
+    "last_image_desc": "Man on motorcycle has moved forward with arms still outstretched.",
+    "challenge": "Linear motion",
+    "caption": "Man rides motorcycle forward with arms outstretched."
+  },
+  {
+    "folder": "man-eat",
+    "first_image_desc": "Man in black shirt holding spoonful of food near mouth.",
+    "last_image_desc": "Man in black shirt chewing food with spoon lowered.",
+    "challenge": "Large motion",
+    "caption": "Man eats food with a spoon."
+  },
+  {
+    "folder": "mbike-trick",
+    "first_image_desc": "Motorcyclist faces forward on a road with smoke behind the rear tire.",
+    "last_image_desc": "Motorcyclist stopped with smoke around rear tire and another person approaching.",
+    "challenge": "Large motion",
+    "caption": "The motorcycle is charging forward while spewing smoke."
+  },
+  {
+    "folder": "miami-surf",
+    "first_image_desc": "Several surfers riding waves with one surfer in the foreground.",
+    "last_image_desc": "One surfer on a blue board rides a wave while others are gone.",
+    "challenge": "Occlusion",
+    "caption": "Surfers ride waves as some disappear behind the surf."
+  },
+  {
+    "folder": "monkeys-trees",
+    "first_image_desc": "A monkey climbs a branch while another sits on a log.",
+    "last_image_desc": "One monkey sits on the log and another leaps leftward through the air.",
+    "challenge": "Large motion",
+    "caption": "A monkey jumps leftward from the log while another stays."
+  },
+  {
+    "folder": "mtb-race",
+    "first_image_desc": "Cyclist riding on a dirt trail through a green forest.",
+    "last_image_desc": "Empty dirt trail winding through a sunlit green forest.",
+    "challenge": "Occlusion",
+    "caption": "The cyclist overtakes the cyclist ahead by passing on the right."
+  },
+  {
+    "folder": "paragliding",
+    "first_image_desc": "Paraglider high above a green valley and village buildings.",
+    "last_image_desc": "Paraglider lower and further left above the valley and village.",
+    "challenge": "Linear motion",
+    "caption": "Paraglider descends to the left above the valley."
+  },
+  {
+    "folder": "paragliding-launch",
+    "first_image_desc": "Person with helmet stands on grassy hill with paragliding gear.",
+    "last_image_desc": "Person with helmet is airborne above grassy hill with paragliding gear.",
+    "challenge": "Large motion",
+    "caption": "Paraglider runs and lifts off from grassy hillside."
+  },
+  {
+    "folder": "paragliding-sky",
+    "first_image_desc": "Paraglider with red canopy high in the sky over mountains.",
+    "last_image_desc": "Paraglider with red canopy has moved leftward over mountains and sea.",
+    "challenge": "Near-static",
+    "caption": "A paraglider moves leftward through the sky over mountains."
+  },
+  {
+    "folder": "parkour",
+    "first_image_desc": "Man jumps over metal fence in urban outdoor area.",
+    "last_image_desc": "Man climbs over metal railing near apartment buildings.",
+    "challenge": "Large motion",
+    "caption": "Man moves along walkway and climbs over metal railing."
+  },
+  {
+    "folder": "people-sunset",
+    "first_image_desc": "Several people walk down a sandy path toward the ocean at sunset.",
+    "last_image_desc": "People continue walking down the path as the sun sets over the ocean.",
+    "challenge": "Large motion",
+    "caption": "People walk down a sandy trail toward the ocean at sunset."
+  },
+  {
+    "folder": "pigs",
+    "first_image_desc": "Three pigs stand on dirt ground facing right.",
+    "last_image_desc": "Two pigs stand close together on dirt ground.",
+    "challenge": "Occlusion",
+    "caption": "One pig walks right past the brown pig."
+  },
+  {
+    "folder": "rabbit-cute",
+    "first_image_desc": "White and gray rabbit sitting in green grass near a wire fence.",
+    "last_image_desc": "White and gray rabbit sitting in green grass near a wire fence.",
+    "challenge": "Near-static",
+    "caption": "Rabbit sits still in the grass by the fence."
+  },
+  {
+    "folder": "rhino",
+    "first_image_desc": "A rhinoceros stands near rocks and a tree in a zoo enclosure.",
+    "last_image_desc": "A rhinoceros is partially hidden behind a tree in a zoo enclosure.",
+    "challenge": "Occlusion",
+    "caption": "A rhinoceros walks left and becomes hidden behind a tree."
+  },
+  {
+    "folder": "rhino-dirt",
+    "first_image_desc": "A rhinoceros stands on dirt facing right.",
+    "last_image_desc": "A rhinoceros stands on dirt slightly farther right.",
+    "challenge": "Linear motion",
+    "caption": "A rhinoceros walks right across a dirt enclosure."
+  },
+  {
+    "folder": "rollercoaster",
+    "first_image_desc": "Roller coaster car at the top of an orange track loop.",
+    "last_image_desc": "Roller coaster car descending a steep orange track with blue supports.",
+    "challenge": "Large motion",
+    "caption": "Roller coaster car descends the orange loop track."
+  },
+  {
+    "folder": "run-girl",
+    "first_image_desc": "Girl in orange shirt stands in wheat field at sunset.",
+    "last_image_desc": "Girl in orange shirt moves forward in wheat field at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Girl runs forward through the wheat field."
+  },
+  {
+    "folder": "salsa",
+    "first_image_desc": "A group of dancers in coordinated outfits perform outdoors before a crowd.",
+    "last_image_desc": "The dancers have moved closer together forming a tighter circle facing inward.",
+    "challenge": "Large motion",
+    "caption": "Dancers move inward forming a circle during outdoor performance."
+  },
+  {
+    "folder": "santa",
+    "first_image_desc": "Man in Santa suit with headphones raises right hand near Christmas tree.",
+    "last_image_desc": "Man in Santa suit with headphones points both hands near Christmas tree.",
+    "challenge": "Large motion",
+    "caption": "Santa who is lost in the song, dances."
+  },
+  {
+    "folder": "schoolgirls",
+    "first_image_desc": "Four schoolchildren with backpacks stand near a wall and potted plants.",
+    "last_image_desc": "Three schoolchildren walk left while one girl remains by the potted plant.",
+    "challenge": "Large motion",
+    "caption": "Three schoolchildren walk left away from the entrance."
+  },
+  {
+    "folder": "scooter-board",
+    "first_image_desc": "Man rides a hoverboard kart toward the camera at an expo.",
+    "last_image_desc": "Man on hoverboard kart is hidden behind a large black booth structure.",
+    "challenge": "Occlusion",
+    "caption": "Man on hoverboard kart moves away and becomes hidden behind booth."
+  },
+  {
+    "folder": "scooter-gray",
+    "first_image_desc": "Man on scooter turning right at intersection near parked scooters.",
+    "last_image_desc": "Man on scooter rides away from intersection past street signs.",
+    "challenge": "Linear motion",
+    "caption": "A person rides a scooter to the left."
+  },
+  {
+    "folder": "seasnake",
+    "first_image_desc": "A banded sea snake is near the left side on sandy seabed.",
+    "last_image_desc": "The banded sea snake has moved right and is more extended on seabed.",
+    "challenge": "Large motion",
+    "caption": "A banded sea snake swims across the ocean floor."
+  },
+  {
+    "folder": "sheep",
+    "first_image_desc": "A brown sheep and three lambs stand near a tree in a field.",
+    "last_image_desc": "The brown sheep has moved rightward away from the tree with three lambs.",
+    "challenge": "Large motion",
+    "caption": "The brown sheep walks rightward away from the tree."
+  },
+  {
+    "folder": "skate-jump",
+    "first_image_desc": "A person on a skateboard approaches a wooden picnic table outdoors.",
+    "last_image_desc": "The person on a skateboard rides away from the picnic table close to the camera.",
+    "challenge": "Large motion",
+    "caption": "A skateboarder jumps over a picnic table."
+  },
+  {
+    "folder": "skate-park",
+    "first_image_desc": "A skateboarder rides down the slope in a concrete skatepark bowl.",
+    "last_image_desc": "The skateboarder rides up the opposite side of the skatepark bowl.",
+    "challenge": "Large motion",
+    "caption": "A skateboarder rides across the skatepark bowl."
+  },
+  {
+    "folder": "snowboard",
+    "first_image_desc": "Person in black helmet snowboarding on a snowy slope.",
+    "last_image_desc": "Person in black helmet carving sharply on a snowboard, snow spraying.",
+    "challenge": "Large motion",
+    "caption": "The snowboarder jumps counterclockwise and lands."
+  },
+  {
+    "folder": "soapbox",
+    "first_image_desc": "Two people in a blue soapbox car approach a wooden ramp.",
+    "last_image_desc": "The soapbox car descends the ramp with both people aboard.",
+    "challenge": "Large motion",
+    "caption": "Soapbox car drives up and over the wooden ramp."
+  },
+  {
+    "folder": "soccer",
+    "first_image_desc": "Person in gray sweatshirt balances soccer ball on right foot.",
+    "last_image_desc": "Person in gray sweatshirt kicks soccer ball with left foot.",
+    "challenge": "Large motion",
+    "caption": "Person is performing a soccer ball kick-up."
+  },
+  {
+    "folder": "squirrel",
+    "first_image_desc": "A ground squirrel sits upright near a rock eating something.",
+    "last_image_desc": "The ground squirrel sits in the same spot still eating.",
+    "challenge": "Near-static",
+    "caption": "The ground squirrel nibbles food while sitting upright."
+  },
+  {
+    "folder": "stretch-girl",
+    "first_image_desc": "Woman in white sits cross-legged on grass with hands on knees.",
+    "last_image_desc": "Woman sits cross-legged on grass with both arms raised overhead.",
+    "challenge": "Large motion",
+    "caption": "Woman extends her arms forward while sitting cross-legged on grass."
+  },
+  {
+    "folder": "stroller",
+    "first_image_desc": "Woman pushing stroller with child past shop window on cobblestone street.",
+    "last_image_desc": "Woman and stroller have moved further right along the shop window.",
+    "challenge": "Linear motion",
+    "caption": "Woman pushes stroller with child past shop window to the right."
+  },
+  {
+    "folder": "stunt",
+    "first_image_desc": "Person in blue shirt rides scooter on skatepark ledge.",
+    "last_image_desc": "Person in blue shirt rides scooter away on green skatepark floor.",
+    "challenge": "Large motion",
+    "caption": "Person rides scooter down ledge and onto skatepark floor."
+  },
+  {
+    "folder": "subway",
+    "first_image_desc": "Several people walk past benches on a subway platform.",
+    "last_image_desc": "Two women and a man walk past benches on a subway platform.",
+    "challenge": "Occlusion",
+    "caption": "People walk to the left on the subway platform."
+  },
+  {
+    "folder": "sunset",
+    "first_image_desc": "Sailboat on calm sea with large sun low in orange sky.",
+    "last_image_desc": "Sailboat on calm sea with sun higher in orange sky.",
+    "challenge": "Linear motion",
+    "caption": "Sailboat moves right across the sea at sunset."
+  },
+  {
+    "folder": "sunset-girl",
+    "first_image_desc": "A woman stands on the shore at sunset holding a light.",
+    "last_image_desc": "A woman walks left on the shore at sunset holding a light.",
+    "challenge": "Linear motion",
+    "caption": "Woman walks right holding lights at sunset."
+  },
+  {
+    "folder": "sunset-walk",
+    "first_image_desc": "Person's legs entering from right on a path at sunset.",
+    "last_image_desc": "Person walking away on the path toward the sunset.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward along the path toward the sunset."
+  },
+  {
+    "folder": "sweep",
+    "first_image_desc": "A broom sweeps debris toward a red dustpan on a wooden floor.",
+    "last_image_desc": "The broom and dustpan are together with no debris visible on the floor.",
+    "challenge": "Large motion",
+    "caption": "Broom sweeps debris toward the dustpan on the floor."
+  },
+  {
+    "folder": "tandem",
+    "first_image_desc": "Two people paragliding above a green valley with mountains behind.",
+    "last_image_desc": "Two people paragliding above grassy hills with a winding road visible.",
+    "challenge": "Large motion",
+    "caption": "Two people paraglide forward over mountains and grassy hills."
+  },
+  {
+    "folder": "tennis",
+    "first_image_desc": "Man in white shirt prepares to hit tennis ball on clay court.",
+    "last_image_desc": "Man in white shirt stands ready with racket on clay tennis court.",
+    "challenge": "Large motion",
+    "caption": "The man runs to the left, hits the tennis ball, and returns to his original position."
+  },
+  {
+    "folder": "tennis-vest",
+    "first_image_desc": "Man in blue tank top stands ready on clay tennis court.",
+    "last_image_desc": "Man in blue tank top moves to his left on clay court.",
+    "challenge": "Large motion",
+    "caption": "Tennis player moves right and returns the ball."
+  },
+  {
+    "folder": "tiger-tree",
+    "first_image_desc": "A tiger walks left in front of a fallen tree.",
+    "last_image_desc": "A tiger walks further left in front of a fallen tree.",
+    "challenge": "Large motion",
+    "caption": "A tiger slowly walks to the right passing a fallen tree."
+  },
+  {
+    "folder": "tractor",
+    "first_image_desc": "A green tractor with trailer turning onto a dirt road.",
+    "last_image_desc": "The tractor and trailer have moved further down the dirt road.",
+    "challenge": "Linear motion",
+    "caption": "A tractor drives away on a dirt road."
+  },
+  {
+    "folder": "tractor-green",
+    "first_image_desc": "A beige off-road truck with muddy tires faces left on grass.",
+    "last_image_desc": "The beige off-road truck has moved further left on the grassy field.",
+    "challenge": "Large motion",
+    "caption": "The off-road truck drives rightward onto the grassy field."
+  },
+  {
+    "folder": "tractor-sand",
+    "first_image_desc": "A red tractor with driver moves left on a sandy arena.",
+    "last_image_desc": "The red tractor is further left, mostly behind a jump obstacle.",
+    "challenge": "Occlusion",
+    "caption": "The tractor drives left behind the jump obstacle."
+  },
+  {
+    "folder": "train",
+    "first_image_desc": "A blue model train with three cars rounds a curve near a station.",
+    "last_image_desc": "The blue model train and cars have moved further along the curved track.",
+    "challenge": "Large motion",
+    "caption": "A blue model train moves past a station on a curved track."
+  },
+  {
+    "folder": "train-snow",
+    "first_image_desc": "A train approaches on snowy tracks with a red signal light.",
+    "last_image_desc": "The train is much closer on the snowy tracks with red signal light.",
+    "challenge": "Large motion",
+    "caption": "A freight train moves forward through heavy falling snow."
+  },
+  {
+    "folder": "upside-down",
+    "first_image_desc": "Man and girl seated on amusement park ride with harnesses.",
+    "last_image_desc": "Man and girl seated on ride with harnesses, girl looking downward.",
+    "challenge": "Large motion",
+    "caption": "Amusement park ride rotates carrying man and girl upward."
+  },
+  {
+    "folder": "varanus-cage",
+    "first_image_desc": "A lizard stands on a branch in a terrarium.",
+    "last_image_desc": "The lizard is farther right on the branch with tongue extended.",
+    "challenge": "Large motion",
+    "caption": "The lizard walks right along the branch."
+  },
+  {
+    "folder": "walking",
+    "first_image_desc": "Man and woman walking on city sidewalk. Man in blue jacket.",
+    "last_image_desc": "Man in blue jacket walking alone on city sidewalk.",
+    "challenge": "Occlusion",
+    "caption": "Woman moves out of view behind the man."
+  },
+  {
+    "folder": "woman-cry",
+    "first_image_desc": "Woman sitting on bed covering her face. Man sits behind her.",
+    "last_image_desc": "Woman remains seated covering her face. Man sits behind her holding phone.",
+    "challenge": "Near-static",
+    "caption": "Woman sits on bed crying while covering her face with hands."
+  },
+  {
+    "folder": "worry",
+    "first_image_desc": "Man with hand on chin looking down thoughtfully.",
+    "last_image_desc": "Man with hand on chin looking up to the right.",
+    "challenge": "Large motion",
+    "caption": "Man raises head and looks up to the right."
+  },
+  {
+    "folder": "writing",
+    "first_image_desc": "Person in black shirt writing on paper beside a laptop.",
+    "last_image_desc": "Person in black shirt writing on paper beside a laptop.",
+    "challenge": "Near-static",
+    "caption": "Person writes on paper next to an open laptop."
+  }
+]

81_dataset_caption.json

@@ -0,0 +1,828 @@
+[
+  {
+    "folder": "meerkat",
+    "first_image_desc": "Two meerkats are facing left with heads close together.",
+    "last_image_desc": "Only one meerkat remains on the left facing left.",
+    "challenge": "Occlusion",
+    "caption": "The right meerkat moves out of view to the right."
+  },
+  {
+    "folder": "knife",
+    "first_image_desc": "Hand holds a knife above a head of napa cabbage.",
+    "last_image_desc": "Knife slices through napa cabbage as hand holds it steady.",
+    "challenge": "Dynamic motion",
+    "caption": "Knife slices cabbage into thin strips."
+  },
+  {
+    "folder": "butterfly",
+    "first_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "last_image_desc": "Butterfly perched on a yellow marigold flower.",
+    "challenge": "Near-static",
+    "caption": "Butterfly remains still on the yellow marigold flower."
+  },
+  {
+    "folder": "person-hand",
+    "first_image_desc": "Person in white outfit stands with arm at side.",
+    "last_image_desc": "Person in white outfit extends hand forward.",
+    "challenge": "Linear motion",
+    "caption": "Person extends hand forward."
+  },
+  {
+    "folder": "elephant-apple",
+    "first_image_desc": "Man holds apple near elephant with raised trunk by water.",
+    "last_image_desc": "Man throws apple toward elephant with open mouth and raised trunk.",
+    "challenge": "Dynamic motion",
+    "caption": "Man throws apple toward elephant with open mouth."
+  },
+  {
+    "folder": "person-sunset",
+    "first_image_desc": "Person in water facing sunset with arms down.",
+    "last_image_desc": "Person in water facing sunset with both hands on head.",
+    "challenge": "Dynamic motion",
+    "caption": "Person raises hands to head in the water at sunset."
+  },
+  {
+    "folder": "child-run",
+    "first_image_desc": "A child in blue and red runs on a dirt path in a field.",
+    "last_image_desc": "The child is farther along the dirt path in the field.",
+    "challenge": "Linear motion",
+    "caption": "A child runs along a dirt path through the field."
+  },
+  {
+    "folder": "woman-arm",
+    "first_image_desc": "Woman in blue dress smiling with arms outstretched in field.",
+    "last_image_desc": "Woman in blue dress facing away walking toward cows in field.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman turns and walks away toward cows in the field."
+  },
+  {
+    "folder": "kangaroo",
+    "first_image_desc": "A kangaroo stands on grass facing left with head turned slightly forward.",
+    "last_image_desc": "The kangaroo stands on grass facing more forward with head turned toward camera.",
+    "challenge": "Dynamic motion",
+    "caption": "Kangaroo turns its head to look toward the camera."
+  },
+  {
+    "folder": "surfer",
+    "first_image_desc": "Two people with surfboards start running toward the ocean.",
+    "last_image_desc": "Two people with surfboards run further across the sand toward the water.",
+    "challenge": "Dynamic motion",
+    "caption": "Two surfers run toward the ocean carrying surfboards."
+  },
+  {
+    "folder": "jog-tree",
+    "first_image_desc": "Person running away on a leaf-covered forest path.",
+    "last_image_desc": "Person farther away running on the same forest path.",
+    "challenge": "Linear motion",
+    "caption": "Person runs away down a tree-lined path."
+  },
+  {
+    "folder": "walk-snow",
+    "first_image_desc": "Two people walk away on a snowy forest path.",
+    "last_image_desc": "Two people are farther along the snowy forest path.",
+    "challenge": "Dynamic motion",
+    "caption": "Two people walk forward on a snowy path."
+  },
+  {
+    "folder": "rooster",
+    "first_image_desc": "A rooster stands on a branch with head turned left.",
+    "last_image_desc": "The rooster stands on the branch with head facing forward.",
+    "challenge": "Linear motion",
+    "caption": "The rooster turns its head from left to forward."
+  },
+  {
+    "folder": "suv-road",
+    "first_image_desc": "One SUV far away on a dirt road. Another SUV partly visible at left.",
+    "last_image_desc": "Two SUVs driving away on a dirt road. Both fully visible.",
+    "challenge": "Occlusion",
+    "caption": "SUV drives onto the dirt road and follows the other SUV."
+  },
+  {
+    "folder": "dog-grass",
+    "first_image_desc": "A dog stands in tall green grass facing forward.",
+    "last_image_desc": "The dog runs forward through the tall grass.",
+    "challenge": "Dynamic motion",
+    "caption": "A dog runs forward through tall grass."
+  },
+  {
+    "folder": "car-highway",
+    "first_image_desc": "Red and white cars drive side by side on a highway.",
+    "last_image_desc": "Red car moves ahead of the white car on the highway.",
+    "challenge": "Dynamic motion",
+    "caption": "The cars are moving forward on the highway."
+  },
+  {
+    "folder": "hummingbird",
+    "first_image_desc": "Hummingbird hovers near pink flowers with wings blurred in motion.",
+    "last_image_desc": "Hummingbird faces downward feeding from pink flowers with wings blurred.",
+    "challenge": "Dynamic motion",
+    "caption": "Hummingbird moves downward to feed from pink flowers."
+  },
+  {
+    "folder": "duckling",
+    "first_image_desc": "Yellow duckling sitting upright on grass facing left.",
+    "last_image_desc": "Yellow duckling curled down with head tucked under body.",
+    "challenge": "Dynamic motion",
+    "caption": "Duckling lowers head and tucks it under its body."
+  },
+  {
+    "folder": "skateboard",
+    "first_image_desc": "Person on skateboard facing left with sun behind.",
+    "last_image_desc": "Person on skateboard facing right with sun behind.",
+    "challenge": "Dynamic motion",
+    "caption": "Person turns on skateboard under bright sunlight."
+  },
+  {
+    "folder": "woman-exercise",
+    "first_image_desc": "Woman in pink workout clothes lifts right knee indoors.",
+    "last_image_desc": "Woman in pink workout clothes lowers right knee indoors.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman lifts and lowers right knee during exercise indoors."
+  },
+  {
+    "folder": "walk-bench",
+    "first_image_desc": "A person walks on a path near a bench at sunrise.",
+    "last_image_desc": "The person is farther along the path near the bench at sunrise.",
+    "challenge": "Linear motion",
+    "caption": "A person walks along a path toward the sunrise."
+  },
+  {
+    "folder": "dog-frisbee",
+    "first_image_desc": "Two dogs chase an orange frisbee on the wet sand.",
+    "last_image_desc": "Two dogs stand together at the water's edge with the frisbee.",
+    "challenge": "Dynamic motion",
+    "caption": "Two dogs run and catch a frisbee by the shoreline."
+  },
+  {
+    "folder": "cyclist-road",
+    "first_image_desc": "A cyclist is entering from the left on a rural road.",
+    "last_image_desc": "The cyclist is centered and further along the road.",
+    "challenge": "Linear motion",
+    "caption": "A cyclist moves forward along a country road."
+  },
+  {
+    "folder": "dog-soccer",
+    "first_image_desc": "A black and white dog runs toward a soccer ball on sand.",
+    "last_image_desc": "The dog runs left with the soccer ball in its mouth on sand.",
+    "challenge": "Dynamic motion",
+    "caption": "Dog grabs soccer ball and runs left on the sand."
+  },
+  {
+    "folder": "penguin",
+    "first_image_desc": "Penguin stands on rock with head upright in snowy landscape.",
+    "last_image_desc": "Penguin stands on rock with head bent down toward chest.",
+    "challenge": "Dynamic motion",
+    "caption": "Penguin lowers its head to preen its chest."
+  },
+  {
+    "folder": "man-lake",
+    "first_image_desc": "Person standing on dock about to jump into lake.",
+    "last_image_desc": "Ripples in water where person landed. Person no longer visible.",
+    "challenge": "Occlusion",
+    "caption": "Person jumps from dock into lake causing large splash."
+  },
+  {
+    "folder": "burger",
+    "first_image_desc": "Open sandwich bun with vegetables on a black tray.",
+    "last_image_desc": "Burger patty partially out of view on the left sandwich bun.",
+    "challenge": "Occlusion",
+    "caption": "Burger patty moves left off the sandwich bun."
+  },
+  {
+    "folder": "woman-rocky",
+    "first_image_desc": "Woman stands on rocky ground with left arm lowered.",
+    "last_image_desc": "Woman stands on rocky ground with left arm raised upward.",
+    "challenge": "Dynamic motion",
+    "caption": "Woman raises her left arm while stretching outdoors."
+  },
+  {
+    "folder": "parrot",
+    "first_image_desc": "Red parrot facing left with green foliage background.",
+    "last_image_desc": "Red parrot facing right with green foliage background.",
+    "challenge": "Linear motion",
+    "caption": "Parrot turns head from left to right."
+  },
+  {
+    "folder": "wakeboarder",
+    "first_image_desc": "Person in orange vest wakeboarding near left edge of water.",
+    "last_image_desc": "Person in orange vest wakeboarding farther right with water spray.",
+    "challenge": "Linear motion",
+    "caption": "Wakeboarder moves quickly right across the water."
+  },
+  {
+    "folder": "dog-park",
+    "first_image_desc": "A black and white dog stands on grass far from the camera.",
+    "last_image_desc": "The dog stands much closer on the grass facing the camera.",
+    "challenge": "Dynamic motion",
+    "caption": "A dog runs toward the camera across the grass."
+  },
+  {
+    "folder": "lion-yawn",
+    "first_image_desc": "A lioness yawns with mouth wide open beside another lioness.",
+    "last_image_desc": "Both lionesses rest with mouths closed facing the same direction.",
+    "challenge": "Dynamic motion",
+    "caption": "Lioness closes mouth after yawning beside another lioness."
+  },
+  {
+    "folder": "cyclist-four",
+    "first_image_desc": "Three cyclists ride away on a tree-lined path.",
+    "last_image_desc": "One cyclist rides away alone on the same path.",
+    "challenge": "Occlusion",
+    "caption": "Cyclists ride away down a tree-lined path."
+  },
+  {
+    "folder": "husky",
+    "first_image_desc": "A husky stands on grass with mountains and trees behind.",
+    "last_image_desc": "The husky lies down on the grass facing forward.",
+    "challenge": "Dynamic motion",
+    "caption": "The husky lies down on the grass."
+  },
+  {
+    "folder": "city",
+    "first_image_desc": "Blurry city skyline and beach with no people visible.",
+    "last_image_desc": "Woman in blue top holds camera facing city skyline and beach.",
+    "challenge": "Occlusion",
+    "caption": "Woman raises camera to photograph the city skyline and beach."
+  },
+  {
+    "folder": "silver-car",
+    "first_image_desc": "Front of a silver car entering a railroad crossing.",
+    "last_image_desc": "Rear of a silver car leaving the railroad crossing.",
+    "challenge": "Linear motion",
+    "caption": "Silver car drives across the railroad crossing leftward."
+  },
+  {
+    "folder": "hand-water",
+    "first_image_desc": "Hands apart under running water.",
+    "last_image_desc": "Hands clasped together under running water.",
+    "challenge": "Dynamic motion",
+    "caption": "Hands move together under running water."
+  },
+  {
+    "folder": "salad",
+    "first_image_desc": "Hands holding two spoons above a bowl of fruit salad.",
+    "last_image_desc": "Hands holding two spoons above a bowl of fruit salad.",
+    "challenge": "Dynamic motion",
+    "caption": "Spoons lift fruit salad upward from the bowl."
+  },
+  {
+    "folder": "air-conditioner",
+    "first_image_desc": "Remote control displays 21°C near an air conditioner.",
+    "last_image_desc": "Remote control displays 27°C near an air conditioner.",
+    "challenge": "Near-static",
+    "caption": "Temperature setting on the remote increases from 21 to 27 degrees."
+  },
+  {
+    "folder": "baby-duck",
+    "first_image_desc": "Duckling swimming on water facing left with ripples behind.",
+    "last_image_desc": "Duckling swimming left with beak open and ripples behind.",
+    "challenge": "Large motion",
+    "caption": "Duckling swims left and dips head into the water."
+  },
+  {
+    "folder": "beach-ball",
+    "first_image_desc": "Man with ball and dog near water, woman stands on sand.",
+    "last_image_desc": "Woman holds ball on sand, man and dog near water's edge.",
+    "challenge": "Large motion",
+    "caption": "Woman catches ball thrown by man on the beach."
+  },
+  {
+    "folder": "beach-metal",
+    "first_image_desc": "Person with metal detector walking on sandy beach near ocean.",
+    "last_image_desc": "Person stands on beach holding metal detector facing ocean waves.",
+    "challenge": "Large motion",
+    "caption": "Person walks forward on the beach with a metal detector."
+  },
+  {
+    "folder": "bear",
+    "first_image_desc": "A brown bear walks left among rocks and dirt.",
+    "last_image_desc": "The brown bear steps forward with one paw raised on a rock.",
+    "challenge": "Large motion",
+    "caption": "The brown bear walks left and steps onto a rock."
+  },
+  {
+    "folder": "bench-swing",
+    "first_image_desc": "Empty wooden swing angled left between two posts outdoors.",
+    "last_image_desc": "Empty wooden swing angled right between two posts outdoors.",
+    "challenge": "Large motion",
+    "caption": "Swing moves from left to right between the posts."
+  },
+  {
+    "folder": "bird",
+    "first_image_desc": "White cockatoo stands on a wooden perch with wings raised.",
+    "last_image_desc": "White cockatoo sits on the perch with wings folded.",
+    "challenge": "Large motion",
+    "caption": "The white parrot repeatedly lowers and raises its body on the tree branch."
+  },
+  {
+    "folder": "bird-tail",
+    "first_image_desc": "A small brown bird stands on mossy wood with wings raised.",
+    "last_image_desc": "The bird faces forward with wings flapping and tail upright.",
+    "challenge": "Large motion",
+    "caption": "Bird is dancing, flapping its wings and shaking its tail feathers."
+  },
+  {
+    "folder": "bmx-bumps",
+    "first_image_desc": "A person in motocross gear rides a bicycle on a dirt track.",
+    "last_image_desc": "A person in dark gear obscures most of the view near the camera.",
+    "challenge": "Occlusion",
+    "caption": "The rider passes behind another person while cycling on bumpy terrain."
+  },
+  {
+    "folder": "book",
+    "first_image_desc": "An open book lies on sand with blank pages visible.",
+    "last_image_desc": "An open book lies on sand with pages curled upward.",
+    "challenge": "Large motion",
+    "caption": "Book pages flip upward in the wind on the sand."
+  },
+  {
+    "folder": "bowl",
+    "first_image_desc": "Hand holds mallet above brass singing bowl in snowy forest.",
+    "last_image_desc": "Hand holds mallet to the side of brass singing bowl.",
+    "challenge": "Large motion",
+    "caption": "Mallet circles counterclockwise around the rim of the singing bowl."
+  },
+  {
+    "folder": "boxing-fisheye",
+    "first_image_desc": "Two boxers with headgear face each other in a ring outdoors.",
+    "last_image_desc": "Boxer in blue headgear lunges toward boxer in red headgear in ring.",
+    "challenge": "Large motion",
+    "caption": "Boxers are punching toward each other."
+  },
+  {
+    "folder": "boy-bike",
+    "first_image_desc": "A boy rides a bicycle on a rural road.",
+    "last_image_desc": "The boy on the bicycle is much closer and smiling.",
+    "challenge": "Linear motion",
+    "caption": "A boy rides a bicycle toward the viewer."
+  },
+  {
+    "folder": "breakdance",
+    "first_image_desc": "Breakdancer balances upside down on one hand in front of crowd.",
+    "last_image_desc": "Breakdancer lands on feet after spinning move in front of crowd.",
+    "challenge": "Large motion",
+    "caption": "Breakdancer spins from handstand to standing position on stage."
+  },
+  {
+    "folder": "brown-sheep",
+    "first_image_desc": "A brown goat stands on green grass facing left.",
+    "last_image_desc": "A brown goat stands on green grass facing forward.",
+    "challenge": "Large motion",
+    "caption": "The goat walks slowly to the left, sniffing the scent of grass."
+  },
+  {
+    "folder": "camel",
+    "first_image_desc": "A camel stands near a wooden fence facing right.",
+    "last_image_desc": "A camel walks away along the fence with another camel visible.",
+    "challenge": "Occlusion",
+    "caption": "A camel walks right as another camel appears behind it."
+  },
+  {
+    "folder": "camel-white",
+    "first_image_desc": "A white two-humped camel stands on grass facing right.",
+    "last_image_desc": "The camel walks right with legs lifted and head forward.",
+    "challenge": "Large motion",
+    "caption": "A Bactrian camel walks right across the grassy enclosure."
+  },
+  {
+    "folder": "cat-girl",
+    "first_image_desc": "Girl holding a kitten close to her face outdoors.",
+    "last_image_desc": "Girl smiling and holding kitten up in front of her face.",
+    "challenge": "Large motion",
+    "caption": "Girl lifts kitten upward in front of her face."
+  },
+  {
+    "folder": "chamaleon",
+    "first_image_desc": "A green chamaleon clings to a branch with legs extended.",
+    "last_image_desc": "The green chamaleon has shifted forward along the branch.",
+    "challenge": "Near-static",
+    "caption": "A chamaleon is hanging from a branch."
+  },
+  {
+    "folder": "color-run",
+    "first_image_desc": "Hands with green powder approach people at a color run event.",
+    "last_image_desc": "Hands move away revealing a runner in white shirt and orange powder.",
+    "challenge": "Occlusion",
+    "caption": "Hands with green powder move past runners at a color run."
+  },
+  {
+    "folder": "cook",
+    "first_image_desc": "Person holding knife and pointing at whole apple pie.",
+    "last_image_desc": "Person places a slice of apple pie on a plate.",
+    "challenge": "Large motion",
+    "caption": "A slice of apple pie is served onto a plate."
+  },
+  {
+    "folder": "cows",
+    "first_image_desc": "Brown and white cow walking left on a dirt path.",
+    "last_image_desc": "Brown and white cow farther left on the dirt path.",
+    "challenge": "Linear motion",
+    "caption": "Cow walks right along the dirt path."
+  },
+  {
+    "folder": "dance-twirl",
+    "first_image_desc": "A woman in a blue dress dances outdoors before a crowd.",
+    "last_image_desc": "The woman in a blue dress raises her arm while dancing.",
+    "challenge": "Large motion",
+    "caption": "A woman in a blue dress performs a dance outdoors."
+  },
+  {
+    "folder": "desert-camel",
+    "first_image_desc": "Two people and two camels walking on sand at sunset.",
+    "last_image_desc": "Two people and two camels further right on sand at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Two people and two camels walk rightward across the desert."
+  },
+  {
+    "folder": "dog-bark",
+    "first_image_desc": "A Doberman with mouth closed looks upward on a leash.",
+    "last_image_desc": "The Doberman has mouth closed and looks slightly to the side.",
+    "challenge": "Large motion",
+    "caption": "Doberman barks, showing its teeth."
+  },
+  {
+    "folder": "dog-beach",
+    "first_image_desc": "A black and brown dog runs on a sandy beach.",
+    "last_image_desc": "The dog continues running on the beach with ears up.",
+    "challenge": "Large motion",
+    "caption": "The dog runs quickly to the left across the sandy beach."
+  },
+  {
+    "folder": "dog-gooses",
+    "first_image_desc": "A black and white dog crouches near a group of ducks on grass.",
+    "last_image_desc": "The dog stands farther right as ducks move away on the grass.",
+    "challenge": "Large motion",
+    "caption": "The dog chases the ducks across the grassy field."
+  },
+  {
+    "folder": "dog-snow",
+    "first_image_desc": "Brown dog facing forward in falling snow.",
+    "last_image_desc": "Brown dog looking to the left in falling snow.",
+    "challenge": "Near-static",
+    "caption": "Dog turns its head left in the snow."
+  },
+  {
+    "folder": "dog-swim",
+    "first_image_desc": "A golden retriever splashes in shallow water facing right.",
+    "last_image_desc": "A golden retriever splashes in shallow water facing forward.",
+    "challenge": "Large motion",
+    "caption": "Dog runs through shallow water toward the viewer."
+  },
+  {
+    "folder": "dog-water",
+    "first_image_desc": "A black and white dog lies behind a white bowl indoors.",
+    "last_image_desc": "The dog stands with its nose in the white bowl on the floor.",
+    "challenge": "Large motion",
+    "caption": "Dog walks forward and puts nose into the bowl."
+  },
+  {
+    "folder": "dogs-scale",
+    "first_image_desc": "A hand holds a small puppy near a kitchen scale on a table.",
+    "last_image_desc": "A puppy sits on the scale while another puppy approaches the front.",
+    "challenge": "Large motion",
+    "caption": "A puppy is placed onto the kitchen scale."
+  },
+  {
+    "folder": "drone",
+    "first_image_desc": "Man holding phone stands by display of drones and gadgets.",
+    "last_image_desc": "Man holds small white drone and phone near display counter.",
+    "challenge": "Large motion",
+    "caption": "Man picks up drone from floor and holds it up."
+  },
+  {
+    "folder": "drum",
+    "first_image_desc": "Man in headphones playing drums with right arm raised.",
+    "last_image_desc": "Man in headphones playing drums with right arm lowered.",
+    "challenge": "Large motion",
+    "caption": "Drummer is passionately playing the drums."
+  },
+  {
+    "folder": "four-walking",
+    "first_image_desc": "Four women in white walk toward the camera on a cobblestone street.",
+    "last_image_desc": "Four women in white close to the camera with legs in motion.",
+    "challenge": "Large motion",
+    "caption": "Four women in white walk forward on a cobblestone street."
+  },
+  {
+    "folder": "frog",
+    "first_image_desc": "A green frog sits on wet pebbles facing left.",
+    "last_image_desc": "The same green frog sits on wet pebbles facing left.",
+    "challenge": "Near-static",
+    "caption": "The frog remains still on the wet pebbles."
+  },
+  {
+    "folder": "gazelle",
+    "first_image_desc": "A gazelle with horns is lying on sandy ground mouth slightly open.",
+    "last_image_desc": "A gazelle with horns is lying on sandy ground mouth closed.",
+    "challenge": "Near-static",
+    "caption": "The gazelle is chewing something."
+  },
+  {
+    "folder": "giant-slalom",
+    "first_image_desc": "Skier in red suit skiing downhill past red flags on snow.",
+    "last_image_desc": "Skier in red suit reappears on right side near blue flag.",
+    "challenge": "Occlusion",
+    "caption": "Skier disappears behind slope and reappears further right."
+  },
+  {
+    "folder": "girl-dog",
+    "first_image_desc": "Girl in wheelchair and dog moving along sidewalk near grass.",
+    "last_image_desc": "Girl in wheelchair reaches out to dog sitting beside her.",
+    "challenge": "Large motion",
+    "caption": "Girl in wheelchair approaches and stops beside sitting dog."
+  },
+  {
+    "folder": "girl-happy",
+    "first_image_desc": "Woman in white shirt smiling with arms outstretched outdoors.",
+    "last_image_desc": "Woman in white shirt smiling and facing left near green plants.",
+    "challenge": "Large motion",
+    "caption": "Woman turns left while smiling outdoors."
+  },
+  {
+    "folder": "girl-music",
+    "first_image_desc": "Person with closed eyes wearing headphones and touching both sides of head.",
+    "last_image_desc": "Person with closed eyes wearing headphones and tilting head downward.",
+    "challenge": "Large motion",
+    "caption": "Person tilts head downward while listening with headphones."
+  },
+  {
+    "folder": "girl-smile",
+    "first_image_desc": "Girl in black jacket touches hair with both hands near her head.",
+    "last_image_desc": "Girl in black jacket smiles with hands lowered and hair loose.",
+    "challenge": "Large motion",
+    "caption": "Girl lowers hands from head and smiles."
+  },
+  {
+    "folder": "girl-turn",
+    "first_image_desc": "Girl in yellow dress faces forward holding skirt.",
+    "last_image_desc": "Girl in yellow dress faces left holding skirt.",
+    "challenge": "Large motion",
+    "caption": "Girl spins clockwise."
+  },
+  {
+    "folder": "goat",
+    "first_image_desc": "A goat stands on rocky terrain facing away.",
+    "last_image_desc": "A goat stands on rocks facing right with head turned.",
+    "challenge": "Large motion",
+    "caption": "A goat steps right on rocky hillside."
+  },
+  {
+    "folder": "goat-branch",
+    "first_image_desc": "A brown goat walks under a large horizontal branch.",
+    "last_image_desc": "The brown goat's head is further forward under the branch.",
+    "challenge": "Large motion",
+    "caption": "A goat is rubbing its back against a tree branch."
+  },
+  {
+    "folder": "gorilla",
+    "first_image_desc": "Adult and young gorilla sitting among green leaves.",
+    "last_image_desc": "Adult and young gorilla sitting among green leaves.",
+    "challenge": "Occlusion",
+    "caption": "Young gorilla moves behind leaves beside adult gorilla."
+  },
+  {
+    "folder": "gym-pull",
+    "first_image_desc": "Man seated on gym machine with arms extended upward holding bar.",
+    "last_image_desc": "Man seated on gym machine with arms extended upward holding bar.",
+    "challenge": "Large motion",
+    "caption": "Man performs lat pulldown exercise on gym machine."
+  },
+  {
+    "folder": "gym-wave",
+    "first_image_desc": "Man in white shirt swings battle ropes in gym.",
+    "last_image_desc": "Man in white shirt swings battle ropes higher in gym.",
+    "challenge": "Large motion",
+    "caption": "A man swings a battle rope at the gym."
+  },
+  {
+    "folder": "hike-man",
+    "first_image_desc": "Person with backpack walking on a sunlit forest path.",
+    "last_image_desc": "Person with backpack farther along the same sunlit forest path.",
+    "challenge": "Linear motion",
+    "caption": "A person walks forward along a forest path."
+  },
+  {
+    "folder": "hoverboard",
+    "first_image_desc": "Person standing on a hoverboard on a wet path near a railing.",
+    "last_image_desc": "Person walking away from a hoverboard on a sloped path.",
+    "challenge": "Large motion",
+    "caption": "Person rides a hoverboard forward and then steps off."
+  },
+  {
+    "folder": "india",
+    "first_image_desc": "Several people walk and ride scooters on a sunlit street.",
+    "last_image_desc": "A man in a plaid shirt blocks most of the view of the street.",
+    "challenge": "Occlusion",
+    "caption": "A man in plaid shirt moves in front of the street scene."
+  },
+  {
+    "folder": "koala",
+    "first_image_desc": "A koala climbs horizontally on a tree branch with head visible.",
+    "last_image_desc": "A koala clings vertically behind a tree trunk with head mostly hidden.",
+    "challenge": "Occlusion",
+    "caption": "Koala climbs up and behind the tree trunk."
+  },
+  {
+    "folder": "makeup",
+    "first_image_desc": "Hand applies makeup brush to woman's closed eyelid.",
+    "last_image_desc": "Hand holds makeup brush above woman's closed eyelid.",
+    "challenge": "Large motion",
+    "caption": "Makeup brush moves upward across eyelid."
+  },
+  {
+    "folder": "man",
+    "first_image_desc": "Man in blue shirt looking forward with neutral expression.",
+    "last_image_desc": "Man in blue shirt with right eye partially closed and swollen.",
+    "challenge": "Occlusion",
+    "caption": "Man raises hand and rubs his right eye."
+  },
+  {
+    "folder": "man-eat",
+    "first_image_desc": "Man in glasses about to eat food with a spoon.",
+    "last_image_desc": "Man in glasses chewing food with mouth closed.",
+    "challenge": "Large motion",
+    "caption": "Man eats food with a spoon and begins chewing."
+  },
+  {
+    "folder": "monkeys-trees",
+    "first_image_desc": "A monkey climbs a branch toward a tree in a grassy area.",
+    "last_image_desc": "A monkey stands on the branches while another monkey is farther left.",
+    "challenge": "Large motion",
+    "caption": "Monkey climbs branches while another monkey jumps leftward."
+  },
+  {
+    "folder": "paragliding-sky",
+    "first_image_desc": "Paraglider with red canopy high above sea and mountains.",
+    "last_image_desc": "Paraglider with red canopy moves leftward above sea and mountains.",
+    "challenge": "Linear motion",
+    "caption": "Paraglider drifts leftward through the sky above the sea."
+  },
+  {
+    "folder": "parkour",
+    "first_image_desc": "Man jumps over a metal barrier in an urban area.",
+    "last_image_desc": "Man stands on a metal railing overlooking a street and greenery.",
+    "challenge": "Large motion",
+    "caption": "Man runs and vaults over barriers and railings outdoors."
+  },
+  {
+    "folder": "rabbit-cute",
+    "first_image_desc": "White and gray rabbit sitting in green grass facing forward.",
+    "last_image_desc": "White and gray rabbit sitting in green grass facing left.",
+    "challenge": "Large motion",
+    "caption": "Rabbit turns head to the right."
+  },
+  {
+    "folder": "rhino",
+    "first_image_desc": "A rhinoceros stands on rocky ground near a tree and log.",
+    "last_image_desc": "The rhinoceros is partially hidden behind a tree and facing left.",
+    "challenge": "Occlusion",
+    "caption": "A rhinoceros walks left and becomes hidden behind a tree."
+  },
+  {
+    "folder": "rhino-dirt",
+    "first_image_desc": "A rhinoceros stands on dirt facing right.",
+    "last_image_desc": "A rhinoceros stands on dirt further right with lifted front leg.",
+    "challenge": "Linear motion",
+    "caption": "The rhinoceros steps forward on the dirt."
+  },
+  {
+    "folder": "run-girl",
+    "first_image_desc": "Girl in yellow shirt stands in wheat field at sunset.",
+    "last_image_desc": "Girl in yellow shirt runs through wheat field at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Girl runs forward through the wheat field."
+  },
+  {
+    "folder": "salsa",
+    "first_image_desc": "Dance group in sparkly outfits facing away from the audience.",
+    "last_image_desc": "Dance group crouching in a circle with arms extended inward.",
+    "challenge": "Large motion",
+    "caption": "Dancers move from standing to crouching in a circle."
+  },
+  {
+    "folder": "santa",
+    "first_image_desc": "Man in Santa suit with headphones raises right hand near Christmas tree.",
+    "last_image_desc": "Man in Santa suit with headphones lowers head and touches headphones.",
+    "challenge": "Large motion",
+    "caption": "Santa who is lost in the song, dances."
+  },
+  {
+    "folder": "scooter-board",
+    "first_image_desc": "Man rides a hoverkart toward the camera at a convention.",
+    "last_image_desc": "Man on hoverkart reappears from behind a large black booth structure.",
+    "challenge": "Occlusion",
+    "caption": "Man on hoverkart circles around a large black booth structure."
+  },
+  {
+    "folder": "soapbox",
+    "first_image_desc": "Two people in a blue soapbox car approach a wooden ramp.",
+    "last_image_desc": "Blue soapbox car has crossed the ramp with one person pushing behind.",
+    "challenge": "Large motion",
+    "caption": "Soapbox car rolls over the wooden ramp on the roadside."
+  },
+  {
+    "folder": "soccer",
+    "first_image_desc": "Person in gray sweatshirt balances soccer ball on foot outdoors.",
+    "last_image_desc": "Person in black pants kicks soccer ball forward on paved ground.",
+    "challenge": "Large motion",
+    "caption": "Soccer ball is kicked upward by the person's foot."
+  },
+  {
+    "folder": "squirrel",
+    "first_image_desc": "A ground squirrel sits upright near a rock holding food.",
+    "last_image_desc": "The ground squirrel sits upright with its paw raised to its mouth.",
+    "challenge": "Near-static",
+    "caption": "The rodent is eating its food."
+  },
+  {
+    "folder": "stretch-girl",
+    "first_image_desc": "Woman sits cross-legged on grass with hands resting on knees.",
+    "last_image_desc": "Woman sits cross-legged on grass with arms raised overhead.",
+    "challenge": "Large motion",
+    "caption": "Woman extends her arms forward while sitting cross-legged on grass."
+  },
+  {
+    "folder": "stroller",
+    "first_image_desc": "Woman pushing stroller with child past shop window on cobblestone street.",
+    "last_image_desc": "Woman and stroller have moved further right along the shop window.",
+    "challenge": "Linear motion",
+    "caption": "Woman pushes stroller with child to the right past shop window."
+  },
+  {
+    "folder": "subway",
+    "first_image_desc": "Several people walk past benches in a subway station.",
+    "last_image_desc": "Two women stand near a pillar in the subway station.",
+    "challenge": "Occlusion",
+    "caption": "People walk past benches at the subway station."
+  },
+  {
+    "folder": "sunset",
+    "first_image_desc": "Sailboat on calm sea with large sun low in red sky.",
+    "last_image_desc": "Sailboat farther right on sea with large sun higher in sky.",
+    "challenge": "Linear motion",
+    "caption": "Sailboat moves right across the sea at sunset."
+  },
+  {
+    "folder": "sunset-girl",
+    "first_image_desc": "Woman holding a light stands on the beach at sunset.",
+    "last_image_desc": "Woman holding a light stands near a large rock at sunset.",
+    "challenge": "Linear motion",
+    "caption": "Woman walks along the beach holding a small light."
+  },
+  {
+    "folder": "sunset-walk",
+    "first_image_desc": "Person's legs entering from right on a path at sunset.",
+    "last_image_desc": "Person walking away on a path toward the sunset.",
+    "challenge": "Linear motion",
+    "caption": "Person walks forward along the path toward the sunset."
+  },
+  {
+    "folder": "sweep",
+    "first_image_desc": "Broom sweeping debris toward red dustpan on wooden floor.",
+    "last_image_desc": "Broom and dustpan on clean wooden floor with debris gone.",
+    "challenge": "Large motion",
+    "caption": "Broom sweeps debris into dustpan on wooden floor."
+  },
+  {
+    "folder": "tiger-tree",
+    "first_image_desc": "A tiger walks left past a large fallen tree.",
+    "last_image_desc": "The tiger has moved further left with its mouth slightly open.",
+    "challenge": "Large motion",
+    "caption": "A tiger slowly walks to the right passing a fallen tree."
+  },
+  {
+    "folder": "tractor-green",
+    "first_image_desc": "A beige off-road truck is angled left near a dirt mound.",
+    "last_image_desc": "The beige off-road truck is fully on flat ground facing left.",
+    "challenge": "Large motion",
+    "caption": "The off-road truck drives rightward onto the grassy field."
+  },
+  {
+    "folder": "train-snow",
+    "first_image_desc": "A train is distant on snowy tracks with falling snow.",
+    "last_image_desc": "The train is much closer on the snowy tracks in heavy snow.",
+    "challenge": "Large motion",
+    "caption": "A freight train moves forward through heavy falling snow."
+  },
+  {
+    "folder": "woman-cry",
+    "first_image_desc": "Woman sitting on bed covering her face with hands. Man behind her.",
+    "last_image_desc": "Woman sitting on bed covering her face with hands. Man behind her.",
+    "challenge": "Near-static",
+    "caption": "Woman sits on bed crying and covering her face with hands."
+  },
+  {
+    "folder": "worry",
+    "first_image_desc": "Man looking down with hand on chin in thought.",
+    "last_image_desc": "Man looking up and to the side with hand on chin.",
+    "challenge": "Large motion",
+    "caption": "Man turns head upward while thinking."
+  },
+  {
+    "folder": "writing",
+    "first_image_desc": "Person in black shirt writes on paper beside laptop and yellow sleeve.",
+    "last_image_desc": "Person in black shirt lifts pencil from paper beside laptop and yellow sleeve.",
+    "challenge": "Large motion",
+    "caption": "Person lifts pencil after writing on paper."
+  }
+]

README.md

@@ -1,3 +1,64 @@
----
-license: mit
----
+# TGI-Bench
+
+TGI-Bench is a benchmark for text-conditioned generative inbetweening.
+
+It provides image sequences together with text annotations for evaluating whether a model can generate intermediate frames that are both temporally plausible and aligned with natural-language descriptions.
+
+The dataset includes four annotation files for different sequence lengths:
+
+- `25_dataset_caption.json`
+- `33_dataset_caption.json`
+- `65_dataset_caption.json`
+- `81_dataset_caption.json`
+
+Each sample is stored in its own folder, and each JSON file contains annotations for the corresponding sequence length.
+
+## Dataset Structure
+
+```text
+TGI-Dataset/
+├── aerobatics/
+│   ├── 00000.jpg
+│   ├── 00001.jpg
+│   └── ...
+├── air_conditioner/
+│   ├── 00000.jpg
+│   ├── 00001.jpg
+│   └── ...
+├── ...
+├── 25_dataset_caption.json
+├── 33_dataset_caption.json
+├── 65_dataset_caption.json
+└── 81_dataset_caption.json
+```
+
+## Annotation Format
+
+Each JSON file is a list of entries like this:
+
+```json
+{
+  "folder": "aerobatics",
+  "first_image_desc": "Man in cockpit of glider flying over patchwork fields.",
+  "last_image_desc": "Man in cockpit of glider banking over fields and clouds.",
+  "challenge": "Large motion",
+  "caption": "Glider floats over fields with man holding control stick."
+}
+```
+
+## Fields
+
+- `folder`: folder name containing the image sequence
+- `first_image_desc`: description of the first frame
+- `last_image_desc`: description of the last frame
+- `challenge`: challenge category
+- `caption`: text description of the sequence
+
+## Usage
+
+This dataset can be used for research on:
+
+- text-conditioned generative inbetweening
+- video frame interpolation
+- vision-language evaluation
+- text-video alignment