Joyce Kozloff remembers a 1972 visit to the home of Georgia O'Keeffe.

Kozloff recalls: "One of O’Keeffe’s large paintings of rocks hung behind her as she sat at the table; she had recently completed it. Throughout the 1960s, she had been creating a series of solitary rocks, which nearly filled the paintings’ surfaces. They have remained her most mysterious, obdurate and “difficult” works for me. Smooth, shiny, impersonal, polished, they radiate a glow from no obvious light source. The forms are reminiscent of her earliest abstractions. I even wondered whether they were a riff on Minimalism, but her art was never ironic."