After 1964, Katz increasingly portrayed groups of figures. He would continue painting these complex groups into the 1970s, portraying the social world of painters, poets, critics, and other colleagues that surrounded him. He began designing sets and costumes for choreographer Paul Taylor in the early 1960s, and he has painted many images of dancers throughout the years. "One Flight Up" (1968) consists of more than 30 portraits of some of the leading lights of New York's intelligentsia during the late 1960s, such as the poet John Ashbery, the art critic Irving Sandler and the curator Henry Geldzahler, who championed Andy Warhol. Each portrait is painted using oils on both sides of a sliver of aluminum that has then been cut into the shape of the subject's head and shoulders. The silhouettes are arranged predominantly in four long rows on a plain metal table.