This checker pattern is aligned vertically and horizontally, but it appears to tilt counterclockwise.pic.twitter.com/H9r7WIWpRB
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Low-pass oriented spatial frequency filters ought to "see this illusion". Similar to Ginsberg's work on Kaniza triangles.
ok, if it doesnt work the way i deduced, this one certainly goes through similar phenomenon as rotating snakes (hopefully?)pic.twitter.com/nKy1o2a0uG
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