necker cube

World English Dictionary
Necker cube (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
[C19: named after Louis Albert Necker (1786--1861), Swiss mineralogist]

Collins English Dictionary - Complete & Unabridged 10th Edition
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