左右の像を重ね合わせて立体視しようとすると、真ん中の凹凸をどちらにしようか、脳が視覚情報を統制しきれず混乱するようだ。
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So that's why whenever i see the Middle earth map my brain says "those are mountains! No! They are valleys! No! Mountains! Valleys!" depending on the flipping angle on which i see it!!
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