How perception works: why what you see is your brain's best guess
Shape from shading: why bumps turn into dents when you flip a picture
Round shapes on a grey page: all of them stick out, but one sinks in. Turn your phone upside down, and they swap. Why does a bump become a dent?
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Miva's next card has round shapes on a grey ground. Rono needs one look: they all stick out, except one that sinks in.
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Look for yourself: which ones stick out? Then turn your phone upside down and look again.
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