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Necker cube


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A simple line drawing of a transparent cube that, when viewed continuously, appears to alternate between two different spatial orientations, a classic example of an ambiguous figure and more specifically of perspective reversal (see illustration). [Named after the Swiss mineralogist Louis Albert Necker (1786–1861) who in 1832 reported his observation that line drawings of crystals appeared to reverse spontaneously]

Necker cube. The figure alternates spontaneously between two perspectives of the cube.

Subjects: Psychology.


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