Optical illusions trick our brains into seeing things that aren't happening. The rotating snakes illusion, created by Akiyoshi Kitaoka, appears to be moving, but it's a still image—not a gif not a movie. What's going on our brains that makes these concentric circles look as if they're rotating?
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Dr. Akiyoshi kitaoka
Cat/illusion video (courtesy Rasmus Bååth):
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