Utrecht: A. Oosthoek's Uitgeversmaatschappij for the International Union of Crystallography, 1965. Escher, M.C. First edition. Hardcover. 84p, 41 pls., many in color. A few light stains to front cover, two tiny spots to one inside margin. No jacket. Very good. Item #30256
Description and analysis of Escher's patterns using classical symmetry, black-and-white symmetry, and polychromatic symmetry. Preface by Escher, who writes "This publication of my periodic drawings represents for me a crown on an important part of my life's work."