Rotating Pieces of Cheese by Akiyoshi Kitaoka
The orange and purple ring appears to rotate clockwise on the green background in a twitching or jerky manner. The effect is enhanced if you move your eyes rapidly around the image or look away from it briefly and then focus on it again.
Compare this effect to another motion illusion created by Professor Kitaoka called Rotating Grapes (where the rotation appears to be much smoother).
(via Akiyoshi Kitaoka)
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