ARG! my brain is going all wavy! Is it because of the grouping of the crosses?
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It is the illusion of striped cords. Kitaoka, A. (1998). Apparent contraction of edge angles. Perception, 27, 1209-1219. http://www.psy.ritsumei.ac.jp/~akitaoka/stripedcorde.html …pic.twitter.com/GFSMRgBYhX
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When you scroll, it actually moves!
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Not true -you see in the snip here that the bottom rows are not straight...pic.twitter.com/ofq4z7tR1j
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Also, moving the image up and down without altering your point of focus (I.e. scrolling on a phone or moving the phone itself) produces the illusion of a wave travelling across the checkerboard. Neat!
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