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Author: Martin Gardner Translator: Tu Hong Excerpted from Fractals, Take-Away Games, and Penrose Tilings, Shanghai Scientific and Technological Education Publishing House Text and images selected from the WeChat account Fun Mathematics (ID: mathfun)   Sir Roger Penrose (1931– ) is a British mathematical physicist known for major work in general relativity and cosmology. He has also contributed to recreational mathematics and philosophy. This article is excerpted from Fractals, Take-Away Games, and Penrose Tilings, a volume in a classic collection of Martin Gardner’s writing on recreational mathematics.   In 1957, Scientific American ran my column on periodic tilings of the plane by congruent convex polygons. The piece was later reprinted in Time Travel and Other Mathematical Bewildermen ...