On the brink of the Depression in 1929, Georgia O'Keeffe - America's first great modernist painter - headed west. In the bright light of the New Mexico desert, she forged an independent life and found the solitude she needed for her truly original art. The photographs taken of her by her older lover scandalized the public. Her flower forms were seen as a shocking and vibrant display of femininity, her bones and skulls as surreal and disturbing. Now, 30 years after her death, to coincide with a major Tate Modern show, imagine - tells the story of Georgia O'Keeffe, one of the most inspiring artists ever.

Although his influence on the history of photography has been nothing short of profound, Paul Strand (1890-1976) remains a curiously shrouded and paradoxical figure. While passionately devoted to humanity, he was happiest in the isolation of the dark room. A pioneer filmmaker (Manhatta, Native Land, Heart of Spain, The Wave), he found the process of collaboration painful. Strand established himself in New York in the 1920's as a master of light and structure, with his now famous photo of Wall Street inspired by the forms and movement of European modernist painters such as Matisse and Picasso. His closeup portraits and landscapes were equally profound. John Walker's Strand.

Georgia O'Keeffe appears on camera for the first time to talk candidly about her work and her life in this 1977 documentary.