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 ?
As noted by the authors, many lines of investigation have converged in recent years to frame the nature and problem of consciousness; studies of perceptual priming where the main effect is mediated nonconsciously; studies of reversible figures (for example, Necker's cube) in which the visual experience is altered without any direct and conscious effort by the percipient; studies of hallucinatory experiences, of dreams, of stimulus saliency.
You've seen, for example, the Necker's cube? When I show it to my students, they always see the initial kinds of variations, tilting left, tilting right.
Free Will and Necker's Cube: Reason, Language and Top-Down Control in Cognitive Neuroscience, GRANT GILLETT and SAM C.