Group Zero, at the Institute of Contemporary Art in Philadelphia, was the first major U.S. museum exhibition of the international art movement founded by Otto Piene and Günther Uecker. Indiana was the only American included in the show, and his painting Zero (1964) featured on the cover of the exhibition catalogue. Although he was not affiliated with the group, he and Uecker later became friends and exchanged works in the late 1960s.
The exhibition traveled to the Washington Gallery of Modern Art, Washington, D.C., January 10–February 16, 1965.