Necker cube

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Necker cube

(ˈnɛkə)
n
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]
References in periodicals archive ?
Made from a geometric hexagonal pattern of necker cubes, it was very reminiscent of the honeycomb.
This lesson is useful enough when looking at Necker cubes and op art, but it becomes crucial when we observe the social world around us.
The Necker cube is slightly different from my goose-shaped ashtray in that I can, almost at will, "flip" the cube and see it the other way.