抽象藝術
During Diller's lifetime, abstract art was not very popular. Abstract artists struggled to gain any form of publicity. Diller noted "your so-called big institutions...were supposed to have done so much for the artists, you know, in the past, the Museum of Modern Art, and so on - - I don't think they had a prohibition against showing American abstract painters, but they didn't show them. They showed very, very few of them."