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Necker cube.
simple wire-frame drawing of a cube that can be perceived ambiguously with respect to the cube's orientation
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About Necker cube
The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. It is a simple, wire-frame, two-dimensional drawing of a translucent cube with no visual cues as to its orientation, so it can be interpreted to have either the lower-left or the upper-right square as its front side.
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