old_contents: # based on https://www.raspberrypi.org/learning/sense-hat-marble-maze/worksheet/
  
  from sense_hat import SenseHat
  import time
  
  sense = SenseHat()
  sense.clear()
  
  time.sleep(0.5)
  
  r = (255, 0, 0 )
  b = (0,0,0)
  w = (255, 255, 255 )
  
  x = 1
  y = 1
  
  maze = [[r,r,r,r,r,r,r,r],
          [r,b,b,b,b,b,b,r],
          [r,r,r,b,r,b,b,r],
          [r,b,r,b,r,r,r,r],
          [r,b,b,b,b,b,b,r],
          [r,b,r,r,r,r,b,r],
          [r,b,b,r,b,b,b,r],
          [r,r,r,r,r,r,r,r]]
  
  def move_marble(pitch, roll, x, y):
      new_x = x
      new_y = y
      if 1 < pitch < 179:
          new_x -= 1
      elif 359 > pitch > 181:
          new_x += 1
      return new_x, new_y
  
  game_over = False
  
  while not game_over:
      pitch = sense.get_orientation()['pitch']
      roll = sense.get_orientation()['roll']
      x,y = move_marble(pitch, roll, x, y)
      maze[y][x] = w
      sense.set_pixels(sum(maze,[]))
  
  
new_contents: # based on https://www.raspberrypi.org/learning/sense-hat-marble-maze/worksheet/
  
  from sense_hat import SenseHat
  
  sense = SenseHat()
  sense.clear()
  
  r = (255, 0, 0 )
  b = (0,0,0)
  w = (255, 255, 255 )
  
  x = 1
  y = 1
  
  maze = [[r,r,r,r,r,r,r,r],
          [r,b,b,b,b,b,b,r],
          [r,r,r,b,r,b,b,r],
          [r,b,r,b,r,r,r,r],
          [r,b,b,b,b,b,b,r],
          [r,b,r,r,r,r,b,r],
          [r,b,b,r,b,b,b,r],
          [r,r,r,r,r,r,r,r]]
  
  def move_marble(pitch, roll, x, y):
      new_x = x
      new_y = y
      if 1 < pitch < 179:
          new_x -= 1
      elif 359 > pitch > 181:
          new_x += 1
      return new_x, new_y
  
  game_over = False
  
  while not game_over:
      pitch = sense.get_orientation()['pitch']
      roll = sense.get_orientation()['roll']
      x,y = move_marble(pitch, roll, x, y)
      maze[y][x] = w
      sense.set_pixels(sum(maze,[]))
  
  
subject: Remove unnecessary sleep command