sentences:  She and Bauer would continue to write to one another regularly, but their relationship became platonic, though still fraught with difficulties.In 1920 Katherine Sophie Dreier, the preeminent collector and co-founder of the Société Anonyme, with Marcel Duchamp and Man Ray, visited Berlin and bought several works by Bauer including the oil "Andante V" (now in the permanent collection of the Yale University Art Gallery).She would later write in 1949 that Bauer's paintings "were very beautiful and subtle in color and helped to introduce abstract art to the people.