Maurits Cornelis Escher. Relativity, 1953. Lithograph, 27.7 x 29.2 cm. Collezione M.C. Escher Foundation, Paesi Bassi. All M.C. Escher works © 2023 The M.C. Escher Company. All rights reserved. The art world has been more hesitant. Escher’s first retrospective took place on his 70th...