Which Georgia O'Keeffe painting series depicts pelvic bones against the sky?

Georgia O'Keeffe's Pelvis series depicts pelvic bones against the sky.

O'Keeffe began making paintings of pelvic bones in the 1940s, drawing on bones she found in the New Mexico desert. In these works, the openings in the bones frame areas of sky, turning anatomical remains into both natural objects and abstract visual structures.

The series reflects her continuing interest in bones as subjects rather than simply as symbols of death. O'Keeffe had already painted animal skulls and other desert remains, but the pelvic bones offered distinctive curved openings and a strong contrast between solid bone and open sky.

The Pelvis series is separate from her Ram's Head paintings, which feature horned skulls, and from her Black Place paintings, which depict dark land formations near Ghost Ranch. These groups share New Mexico subjects but are not interchangeable. O'Keeffe's titles often identify the object directly while leaving the viewer to consider scale, abstraction, and landscape associations.