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| In 1974, mathematical physicist Sir Roger Penrose of the University of Oxford discovered a remarkable aperiodic tileset that would cover a surface without forming a regularly repeating pattern. An early description of these "Penrose tiles" was published as an installment of Martin Gardner's "Mathematical Games" in a 1977 issue of "Scientific American" Dr. Penrose and his father, L.S. Penrose, are also the creators of the puzzling "tribar" and "continuous staircase". M.C. Escher incorporated both of these figures in his "impossible world" drawings. Dr. Penrose corresponded with Escher for several years, and they met in 1962. |