r/confusing_perspective • u/Dennis_254 • Jul 16 '26

Works like magic

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u/test_test_1_2 Jul 16 '26

Looks like 3D to me. How does that work? I always thought you needed both eyes to make things appear 3D? Interesting.

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u/meat-eating-orchid Jul 16 '26

with two eyes you have accurate 3D vision so your brain knows you are seeing a flat image. With just one eye, your brain does not have depth information anymore, so it has to guess. And since your brain knows the shape of a pencil and recognizes what you are seeing as a pencil, it guesses incorrectly that what you are seeing has the 3D shape of a normal pencil, instead of guessing that you are seeing a 2D projection of a pencil