Another new demo of the crater illusion has been produced! Columns (a) appear to be convex whereas columns (b) to be concave, though the luminance gradient of the former is just the mirror image of that of the latter.pic.twitter.com/HNmFEmpqat
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It seems that the reversal is occasionally observed, too.
Second version defaults zigzag when labels are on top! But I can hold either reversal as I rotate phone back to normal.
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