paradox illusion
   Also known as paradox. Both terms are indebted to the Greek words para (beside, near, resembling, accessory to, beyond, apart from, abnormal) and doxa (opinion, expectation). They refer to a * visual illusion mediated by objects or images that are paradoxical or logically impossible. Some well-known examples of the paradox illusion are the * motion aftereffect, the Penrose triangle, and the impossible staircases in the drawing Ascending and Descending by the Dutch graphic artist Maurits Cornelis Escher (1898-1972). The term paradox illusion is used in opposition to the terms * ambiguous illusion, * distortion illusion, and *fiction illusion.
   References
   Gregory, R.L. (1991). Putting illusions in their place. Perception, 20, 1-4.

Dictionary of Hallucinations. . 2010.

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