「みやびなカメ」(2007): カメには赤、緑、灰色の3種類がいるように見えるが、物理的な色で言えば2種類しかいない。 There appear to be red turtles, green ones and gray ones, but actually they are of two colors. cf. Snake illusion: Adelson, E. H. (2000)pic.twitter.com/tLIsILBreY
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