When I started painting the pelvis bones I was most interested in the holes in the bones – what I saw through them – particularly the blue from holding them up in the sun against the sky… They were most beautiful against the Blue – that Blue that will always be there as it is now after all man’s destruction is finished.

Working in series became an increasingly evident approach for O’Keeffe in the 1940s and 1950s. She developed three series simultaneously during this period, each one exploring a path towards abstraction, in parallel to developments in abstract painting in New York. They were also made against the backdrop of the Second World War (referred to in the quotation above), and of Stieglitz’s death in 1946. At the same time O’Keeffe’s work was becoming increasingly prominent, with major solo exhibitions at The Art Institute of Chicago and the Museum of Modern Art in New York.

O’Keeffe continued her investigation of bones, using pelvis bones rather than skulls, held up against the sky, or viewing a distant landscape through an aperture in the bone. Another motif was the patio of O’Keeffe’s house at Abiquiú, her second New Mexico home, with its distinctive door presented in varying degrees of naturalism and abstraction. Lastly the series of cottonwood trees reveals a more painterly approach to the serialised motif.