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Necker cube

/ˈnɛkə/
noun
1.
a line drawing showing the 12 edges of a transparent cube, so that it can be seen alternately facing in two different directions: an example of an ambiguous figure
Word Origin
C19: named after Louis Albert Necker (1786–1861), Swiss mineralogist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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