Roy Lichtenstein's first exhibition with Leo Castelli opened sixty-two years ago today, February 10th, 1962. However, prior to the show, in 1961, Lichtenstein exhibited "Girl with Beach Ball", now in the collection of The Museum of Modern Art, New York, in an almost undocumented show titled "An Exhibition in Progress". We invited Avis Berman to write about the groundbreaking yet unknown 1961 show. Avis Berman is a writer and art historian currently working on a biography of Roy Lichtenstein.