Stieglitz promoted cubists and abstract painters at his 291 Gallery on 5th Avenue. Rosenberg purchased works by almost all of the Cubists. Le Fauconnier was seen as one of the leading figures among the Montparnasse Cubists. There was a distinct difference between Kahnweiler's Cubists and the Salon Cubists. Courbet's importance was announced by Guillaume Apollinaire, poet-spokesperson for the Cubists. This included the work of Cubists Juan Gris and Jacques Lipchitz. He lived in Paris from 1924 to 1934, where he was greatly influenced by Cubists. Hartley developed his painting abilities by observing Cubists in Paris and Berlin. "Circus Sideshow" influenced the Fauves, Cubists, Futurists and Orphists. Sze's work is influenced, in part, by her admiration for Cubists, Russian Constructivists, and Futurists. The synthetic factor was ultimately taken furthest of all from within the Cubists by Gleizes. The Cubists were defended by the Socialist deputy, Marcel Sembat. The Cubists would combine these two approaches in developing a revolution in art.