a pastoral paradise in Le bonheur de vivre, Picasso had turned to an alien tradition of primitive art to create in Les Demoiselles a netherworld of strange gods and violent emotions. As between the mythological nymphs of Le bonheur de vivre and the grotesque effigies of Les Demoiselles, there was no question as to which was the more shocking or more intended to be shocking. Picasso had unleashed a vein of feeling that was to have immense consequences for the art and culture of the modern era while Matisse's ambition came to seem, as he said in his Notes of a Painter, more limited—limited that is, to the realm of aesthetic pleasure. There was thus opened up, in the very first decade of the century and in the work of its two greatest artists, the chasm that has continued to divide the art of the modern era down to our own time. Influences Picasso created hundreds of sketches and studies in preparation for the final work. He long acknowledged the importance of Spanish art and Iberian sculpture as influences on the painting. The work is believed by critics to be influenced by African tribal masks and the art of Oceania, although Picasso denied the connection; many art historians remain skeptical about his denials. Picasso spent an October 1906 evening closely studying a Teke figure from Congo then owned by Matisse. It was later that night that Picasso's first studies for what would become Les Demoiselles d’Avignon were created. Several experts maintain that, at the very least, Picasso visited the Musée d'Ethnographie du Trocadéro (known later as the Musée de l'Homme) in the spring of 1907 where he saw and sought inspiration from African and other arts shortly before completing Les Demoiselles. He had come to this museum originally to study plaster casts of medieval sculptures, then also considered examples of "primitive" art. El Greco In 1907, when Picasso began work on Les Demoiselles, one of the old master painters he greatly admired was El Greco (1541–1614), who at the time was largely obscure and under-appreciated. Picasso's friend Ignacio Zuloaga (1870–1945) acquired El Greco's masterpiece, the Opening of the Fifth Seal, in 1897 for 1000 pesetas. The relation between Les Demoiselles d'Avignon and the Opening of the Fifth Seal was pinpointed in the early 1980s, when the stylistic similarities and the relationship between the motifs and visually identifying qualities of both