Describe how Georgia O'Keeffe and Alfred Stieglitz's relationship evolved from the year they met to his death.

From 1915 until 1946, some 25,000 pieces of paper were exchanged between two major 20th-century artists. Painter Georgia O'Keeffe and photographer Alfred Stieglitz wrote each other letters — sometimes two and three a day, some of them 40 pages long. The correspondence tracks their relationship from acquaintances to admirers to lovers to man and wife to exasperated — but still together — long-marrieds.

The first volume of those letters has just been