/ (ˈnɛkə) /
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
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Word Origin for Necker cube
C19: named after Louis Albert Necker (1786–1861), Swiss mineralogist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012