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Ambiguity in 3-D patterns induced by lighting assumptions

Demonstrates a bistable pattern (illusion) with white and black bars with horizontal and vertical orientations that produce an impression of thin slabs stacked up in depth either toward or away from the observer. It is postulated that the ambiguity is induced by the observer's assumption of the direction of the light source. In order to experience a coherent whole, the observer must assume the existence of 2 mutually exclusive light sources, something that is not a natural task for the visual system. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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