@AkiyoshiKitaoka how about _not_ specifying what the illusion exactly is when you post one? The explanation can be posted in a reply tweet. It would be a pleasant exercise/surprise to your audience to figure out illusions themselves. It will also be a true test of the illusions.
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RGB on the top, CMY on the bottom. No black/white/grey anywhere, and yet images appear black & white ?
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Correct!
End of conversation
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