sentences:  He was recognized with an honorary degree in 1981 and died on a train between Zurich and Milan in 1982 at the age of 68.He wrote about Renaissance art and nineteenth-century sculpture, and authored two prize-winning books, "Apes and Ape Lore in the Middle Ages and the Renaissance" (1952) and "Sculpture of Donatello" (1957).In his later years he was concerned with East–West dialogue in the arts.