a demo of the Oppel-Kundt illusion: The rightmost girl of the left group is placed just at the middle between the leftmost girl and the rightmost lonely one, but she appears to stand rightward.pic.twitter.com/hgNepIC1kF
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>Do all illusions apply all people? No, not at all. For example, I do not see the Ponzo illusion of upright type.pic.twitter.com/0KFI1tGcwT
Do you see the upper one larger than the lower one?pic.twitter.com/vQS4CXdaMj
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