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 Rotating Snake 
     
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The strong (and beautiful) rotation of the wheels occurs in relation to eye movements. On steady fixation the effect vanishes.
  • Even when fixating steadily, illusory motion occurs on appearance/ disappearance
  • Illusion does not depend on colour
  • Rotation direction depends on the polarity of the luminance steps (I arranged these to evoke a gearbox effect here, by mirroring the images appropriately)
  • Strength of illusion depends strongly on background luminance.

The background luminance slowly ramps from 0% to 100% automatically, or you can use the slider. The illusionary rotation is strongest for 50% gray (exact value will depend on your monitor 'gamma').



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