Uploaded August 2021 | Updated September 2026, 1 week ago

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A fantastic color illusion by the genius illusion maker and professor of psychology Akiyoshi Kitaoka. Your eyes see color by contrasting it with other colors, so when the square slides back and forth it appears to change color. There is no trick here; this is just an illusion based on how we perceive color.

Credit: Akiyoshia Kitaoka, used by permission
Original: psy.ritsumei.ac.jp/~akitaoka/colorgradation01-00240.mp4
Kitaoka's website loaded with illusions: psy.ritsumei.ac.jp/~akitaoka