The Schroeder stairs, also called Schouten's staircase (Bool et al. 1982, p. 147), are an ambiguous figure that depicts two different staircases at the same time: one going up from right to left, the other turned upside down. The Schroeder stairs appear in M. C. Escher's works "Relativity" (Bool et al. 1982, p. 306; Forty 2003, Plate 53) and "Convex and Concave" (Bool et al. 1982, p. 308; Forty 2003, Plate 56).
See alsoNecker Cube, Penrose Stairway
This entry contributed by Margherita Barile
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ReferencesBool, F. H.; Kist, J. R.; Locher, J. L.; and Wierda, F. M. C. Escher: His Life and Complete Graphic Work. New York: Abrams, 1982.Carraher, R. G. and Thurston, J. B. Optical Illusions and the Visual Arts. New York: Reinhold, 1966.Escher, M. C. "Relativity." Lithograph. 1953. http://www.mcescher.com/Gallery/back-bmp/LW389.jpg.Escher, M. C. "Convex and Concave." Lithograph. 1955. http://www.mcescher.com/Gallery/recogn-bmp/LW399.jpg.Forty, S. M.C. Escher. Cobham, England: TAJ Books, 2003.
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Barile, Margherita. "Schroeder Stairs." From MathWorld--A Wolfram Web Resource, created by Eric W. Weisstein. https://mathworld.wolfram.com/SchroederStairs.html