A letter from Georgia O’Keeffe to Marjorie Phillips, wife of Duncan Phillips and a painter in her own right, has a postscript that reads, “It was so good to see you here in what I call ‘my good world.'” Dated 1975, this letter reveals that Marjorie Phillips visited O’Keeffe in her New Mexico home, a previously undocumented journey. In 1949, O’Keeffe paid tribute to the long friendship between her husband, Alfred Stieglitz, and Duncan Phillips by willing a series of Stieglitz’s photographs to The Phillips Collection. The 19 photographs, called the Equivalents, feature views of cloud-filled skies. Stieglitz’s goal was to evoke an emotional state through each image. By not including any reference points, including the horizon line, Stieglitz allowed viewers to focus on the abstract qualities of the cloud formations.