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My half-baked hypothesis: The world accidentally stumbled upon the first (to my knowledge) bi-stable color illusion Here is an example of bistable illusion: This bistable illusion involves the perception of motion. Is the dancer spinning clockwise or counterclockwise? The deal is that the image is actually ambiguous. But you can't possible perceive both ...


I disagree that it's an optical illusion at all, but OK, first an obligatory XKCD and it's matching Explain XKCD (and XKCD does present it as an optical illusion, so this goes against my theory - see below): ...

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