Necker Cube (impossible cube or irrational cube)
The illusion plays on the human eye's interpretation of two-dimensional pictures as three-dimensional objects.
Penrose triangle
There exist 3-dimensional solid shapes which, when viewed from a certain angle, appear the same as the purple, green, and yellow 2-dimensional depiction. The term "Penrose triangle" can refer to the 2-dimensional depiction or the impossible object itself.
Impossible geometry
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