Ingres. In the 20th century, his influence was even stronger. Picasso and Matisse were among those who acknowledged a debt to Ingres; Matisse described him as the first painter "to use pure colours, outlining them without distorting them." The startling effects of Ingres's paintings—the collapsing of traditional depth and perspective and the presentation of figures "like the figures in a deck of cards"—were criticized in the 19th century but were welcomed by the avant-garde in the 20th century. An important retrospective of works by Ingres was held at the Salon d'automne in Paris in 1905, which was visited by Picasso, Matisse, and many other artists. The original and striking composition of "The Turkish Bath", shown for the first time in public, had a visible influence on the composition and poses of the figures in Picasso's Les Demoiselles d'Avignon in 1907. The exhibit also included many of his studies for the unfinished mural l'Age d'or, including a striking drawing of women gracefully dancing in a circle. Matisse produced his own version on this composition in his painting La Danse in 1909. The particular pose and colouring of Ingres's Portrait of Monsieur Bertin also made a reappearance in Picasso's Portrait of Gertrude Stein (1906). Barnett Newman credited Ingres as a progenitor of abstract expressionism, explaining: "That guy was an abstract painter ... He looked at the canvas more often than at the model. Kline, de Kooning—none of us would have existed without him." Pierre Barousse, the curator of the Musée Ingres, wrote: ...One realizes in how many ways a variety of artists claim him as their master, from the most plainly conventional of the nineteenth century such as Cabanel or Bouguereau, to the most revolutionary of our century from Matisse to Picasso. A classicist? Above all, he was moved by the impulse to penetrate the secret of natural beauty and to reinterpret it through its own means; an attitude fundamentally different to that of David ... there results a truly personal and unique art admired as much by the Cubists for its plastic autonomy, as by the Surrealists for its visionary qualities. Violon d'Ingres Ingres's well-known passion for playing the violin gave rise to a common expression in the French language, "violon d'Ingres", meaning a second skill beyond the one by which a person is mainly known. Ingres was an amateur violin player from his youth, and played for a time as