[The Picture on the Wall], a short scene and pantomime, which he finished eight days later. Jarnach composed a prelude and the first scene, but lost interest and dropped the project. Undaunted, in June 1918 Busoni offered it to Schoeck. Schoeck, who appears to have taken the offer as a sort of challenge, immediately set aside the orchestration of Don Ranudo, and in three days, produced the new opera. Das Wandbild is set in a Parisian antique shop around 1830. A student, Novalis, is captivated by a picture of a girl hanging on a wall of the shop. The picture comes to life, and in typical Busoni fashion, the scene immediately dissolves into a fantastical Chinese temple. The opera ends with Novalis awaking from his dream-state and escaping from the shop into the reality of the street. It is one of Schoeck's most unusual creations, "almost minimalist in conception." Stylistic shift Around 1918 Schoeck's music began a stylistic shift. At this time he became involved with the pianist Mary de Senger, who appears to have had a profound influence on his compositional style. The second act of his next opera, Venus (1919–1921), employs interesting polyrhythmic and bitonal effects. As he became acquainted with the work of Alban Berg and Les six in Paris, he began to feel isolated by his stylistic conservatism. By 1922 his former mentor, Busoni, who was now back in Berlin, wrote a letter to Volkmar Andreae, saying: "Schoeck has completely abandoned me. I have not entirely given him up. He lacks (or lacked) certain ingredients, which are not available at the chemists'. Which should however be manufactured in his own laboratory." In the summer of 1923 Schoeck visited Arthur Honegger in Paris, and he later participated in the Salzburg ISCM festival. Not long afterwards, his affair with de Senger came to an end. His distress over the breakup, combined with the shock of the new music he had heard in Paris and Salzburg, seems to have led to a new maturity in his compositional style. Two weeks after his affair ended, he composed the song Die Entschwundene (1923), which was "as much a farewell to the tonal world of his previous music as to his departed lover." Schoeck was not given to overt signs of gratitude, but he dedicated the song cycle Gaselen (1923), the Sonata for Bass Clarinet and Piano (1927–28), and the Suite in