sentences:  This moved, in 1947, to another rented space at 1071 Fifth Avenue.Under Rebay's guidance, Guggenheim sought to include in the collection the most important examples of non-objective art available at the time, such as Kandinsky's "Composition 8" (1923), Léger's "Contrast of Forms" (1913) and Delaunay's "Simultaneous Windows" (2nd Motif, 1st Part)" (1912).By the early 1940s, the foundation had accumulated such a large collection of avant-garde paintings that the need for a permanent building to house the art collection had become apparent.