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Kanizsa Triangle
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Kanizsa Triangle

A bright white triangle appears to hover in the center of the figure above, but in reality only the background is present.

ReferenceReferences

[1] G. Kanizsa, "Margini quasi-percettivi in campi con stimolazione omogenea," in Rivista di Psicologia, vol. 49, no. 1, pp. 7-30, 1955.