Angels are an important theme throughout Dali's work. We find a great many references to them in his writings. In an entry dated May 1953 in his Diary of a Genius, Dali wrote, "I have drawn from sunrise until the evening six faces of mathematical angels, explosive, and of such great beauty that I remained exhausted and stiff." And on August 1953, "Everything is on the 'outside' with angels, it is impossible to picture them anymore without this 'outside'.- Robert & Nicolas Descharnes, Catalogue Raisonne, "Le Dur et le Mou", 2004