Fun Optical Illusions

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berkeman
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Borek
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That's a classic, same happens with Moon craters that look either convex or concave on photos. And a bit similar to the hollow-face illusion.
 
256bits
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The bowls were easy.
Finally, it took several seconds to get the top left tray to flip .
 
davenn
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That's a classic, same happens with Moon craters that look either convex or concave on photos.

Yeah, I have always found that one screwy on the eyes/brain
Also happens on hilly/mountains views, on, say on google earth
 

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