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Item Modeling and Rendering Escher-Like Impossible Scenes(Blackwell Publishers Ltd and the Eurographics Association, 1999) Savransky, Guillermo; Dimerman, Dan; Gotsman, CraigInspired by the drawings of "impossible" objects by artists such as M.C. Escher, we describe a mathematical theory which captures some of the underlying principles of their work. Using this theory, we show how impossible three-dimensional scenes may be modeled and rendered synthetically.