Eye Of The Beholder

In "Vision: A Window on Consciousness," Nikos K. Logothetis makes the point that the two perceptions of the Necker cube "optical illusion" compete with each other for entrance into consciousness. Artists exploit this effect by deliberately giving each form in their picture a double, or spatially ambiguous, reading—creating the equivalent of an optical illusion—and thereby evoke strong three-dimensional images. The tension resulting from spatial ambiguity is pleasurable. By compounding the ambiguities in a particular drawing structure, an artist can increase the tension and with it the pleasure it affords. When

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