123Movies. Filmed amidst the Arensberg collection at the Philadelphia Museum of Art, where 35 works by Marcel Duchamp are gathered, this 1956 NBC interview features the artist talking with James Johnson Sweeney, former director of the Guggenheim Museum. Duchamp describes his transition away from Impressionism toward a Cubist, and then post-Cubist, approach, providing commentary while standing before Nude Descending a Staircase