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(12 Kb)

Impossible figures: Schroeder stairs, impossible trefoil... (see, B.Ernst: L'avanture des figures impossibles, Taschen, Berlin, 1990).

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Mosaics from Antioch (see, E.H.Gombrich: Art and Illusion, Phaidon Press, London, 1959).

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Evolution of Thiery figure, tribar and other impossible objects from Koffka cube, and hexagonal "OpTiles".

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