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'''M. C. Escher''' (Maurits Cornelis Escher) (1898-1971) was a [[Dutch]] graphic artist. His work consisted mostly of prints: lithographs, woodcuts, and wood engravings. His work has connections with mathematical themes. Many of them are based on [[tessellation]]s. One of his best known works is "Relativity", which displays several staircases with inhabitants walking each way on them: gravity pulls some inhabitants in different directions than others. "Relativity", like many of Escher's works, was originally done as a lithograph, but then later 'translated' to an ink-print.

'''M. C. Escher''' (Maurits Cornelis Escher) (1898-1971) was a [[Dutch]] graphic artist. His work consisted mostly of prints: lithographs, woodcuts, and wood engravings. His work has connections with mathematical themes. Many of them are based on [[tessellation]]s.  

His transformation pictures feature regular, repeating patterns of objects which change and transform, row by row or column by column. For example, in ''Sky and Water,'' rows of birds start out as realistic and detailed. In successive rows, the birds become less realistic, more stylized, and more vague, and gradually transform themselves into empty spaces between rows of fish at the bottom of the page. Meanwhile, the empty spaces between the birds gradually become more and more fish-shaped and transform themselves into solid fish.

His transformation pictures feature regular, repeating patterns of objects which change and transform, row by row or column by column. For example, in ''Sky and Water,'' rows of birds start out as realistic and detailed. In successive rows, the birds become less realistic, more stylized, and more vague, and gradually transform themselves into empty spaces between rows of fish at the bottom of the page. Meanwhile, the empty spaces between the birds gradually become more and more fish-shaped and transform themselves into solid fish.

Some of his graphics are beautifully elaborated "impossible figures." ''Ascending and Descending'' shows a building with an impossible staircase forms a connected rectangle. One row of monk-like figures traverses the stair in a clockwise direction, always ascending, yet always returning to the same place, while another row traverses the same stairs in a counterclockwise direction, always descending, yet always returning to the same place.

Some of his graphics are beautifully elaborated "impossible figures." ''Ascending and Descending'' shows a building with an impossible staircase forms a connected rectangle. One row of monk-like figures traverses the stair in a clockwise direction, always ascending, yet always returning to the same place, while another row traverses the same stairs in a counterclockwise direction, always descending, yet always returning to the same place.

M. C. Escher's work was popularized in the United States during the late 1950s and early 1960s by Martin Gardner, who wrote a regular column on mathematical recreations for ''Scientific American'' and devoted several columns to explorations of Escher's mathematical themes. The mind-boggling characteristics of his work also appealed to the appreciators of the "[[psychedelic]]" in the 1960s, and cheap poster versions of Escher arts found their way to the walls of college dormitory rooms.  

M. C. Escher's work was popularized in the United States during the late 1950s and early 1960s by Martin Gardner, who wrote a regular column on mathematical recreations for ''Scientific American'' and devoted several columns to explorations of Escher's mathematical themes. The mind-boggling characteristics of his work also appealed to the appreciators of the "[[psychedelic]]" in the 1960s, and cheap poster versions of Escher arts found their way to the walls of college dormitory rooms.