am trying to figure out why this illusion works so well. If I squint my eyes real tight the illusion disappears, so I'm thinking it has to do with the way the semicircles are shaded.
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It is the Café Wall illusion (Münsterberg illusion). http://www.psy.ritsumei.ac.jp/~akitaoka/cafewalle.html …pic.twitter.com/hdEVPHxm4I
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