Huh: http://digg.com/2017/curvature-blindness-illusion … I've always been lousy at calculus, but it occurs to me that if you integrate Y across the shaded sections, one of them has sections with a total delta-Y of 0, the other has sections with a total delta-Y of -1 or +1.
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Oh, that one! That one's a classic, and still incredibly mind-blowing. Thanks for reminding me of it! :D