Hirschfeld was an American graphic artist and caricaturist who was famous for his witty, perceptive, and joyful caricatures of theater celebrities and other public personalities. After becoming a theater correspondent for the New York Herald Tribune, he worked for The New York Times, where many of his caricatures appeared. Hirschfeld also wrote and illustrated several books. Beginning in 1945, Hirschfeld concealed what in almost every drawing that he made? Discuss