According to Wikipedia: "James Abbott McNeill Whistler (July 11, 1834 – July 17, 1903) was an American-born, British-based artist. Averse to sentimentality and moral allusion in painting, he was a leading proponent of the credo "art for art's sake". His famous signature for his paintings was in the shape of a stylized butterfly possessing a long stinger for a tail.[1] The symbol was apt, for it combined both aspects of his personality—his art was characterized by a subtle delicacy, while his public persona was combative. Finding a parallel between painting and music, Whistler titled many of his paintings "arrangements", "harmonies", and "nocturnes", emphasizing the primacy of tonal harmony.[2] His most famous painting is the iconic Whistler's Mother, the revered and oft parodied portrait of motherhood. A wit, dandy, and shameless self-promoter, Whistler influenced the art world and the broader culture of his time with his artistic theories and his friendships with leading artists and writers."