The image appears to rotate counterclockwise.pic.twitter.com/vs4OUzLoDm
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Certainly does for me: it the rotsnake colour scheme, right? But the movement is continuous: in the red-purple one, it jumps in steps.
Color is indispensable. It seems color enhances this type of illusion to some extent.pic.twitter.com/37cRI78WuW
Indeed it does!
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