The museum continued to grow during the years following World War I. In the 1920s, the museum hosted two memorable exhibitions organized by Sally Lewis, the daughter of a prominent Portland family. Lewis had befriended many well-known artists on trips to New York and Europe. In 1923, Lewis organized an exhibition at the museum that included 44 paintings by Picasso, Matisse, André Derain and American modernists, such as Maurice Prendergast, Charles Burchfield, and Max Weber. She was also one of 22 patrons who purchased Derain's "Tree" for the museum's permanent collection. The success of her first exhibition led to her second, more daring endeavor a year later that juxtaposed paintings, drawings, and sculptures from Europe with African masks. Among the sculptures was Brâncuși's "A Muse", which Lewis owned and donated to the museum in 1959.