But mathematics is the sister, as well as the servant, of the arts and is touched by the same madness and genius.

Harold Calvin Marston Morsewas an American mathematician best known for his work on the calculus of variations in the large, a subject where he introduced the technique of differential topology now known as Morse theory. The Morse-Palais lemma, one of the key results in Morse theory, is named after him, as is the Thue-Morse sequence, an infinite binary sequence with many applications.