The left circle appears to be whitish whereas the right one blackish, though they are the same random dots of the same luminance.pic.twitter.com/JSspVObywH
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cf. If observers take a close look at this image, the left heart appears to be yellowish whereas the right one bluish, though they are the same stripes of blue and yellow. Viewed from a distant, the former appears to be whitish whereas the latter blackish.pic.twitter.com/EOliSN7NKU
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