Installation view of Spilling Over: Painting Color in the 1960s (Whitney Museum of American Art, New York, March 29-August 2019). From left to right: Marcia Hafif, 72., March 1965, 1965; Morris Louis, Gamma Delta, 1959-60; Frank Stella, Gran Cairo, 1962; Kay WalkingStick, April Contemplating May, 1972. Photograph by Ron Amstutz