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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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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": "Dynamic 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."
+    }
+]