Georgia O'Keeffe is most famous for her paintings of the American Southwest in which naturalism and abstraction seem permanently intertwined with deserts and mesas. But O'Keeffe's first maturity as an artist came during the 1920s when she spent summers living and painting in Lake George. Many of her iconic ideas and techniques were developed in the Adirondacks. Brian Mann visited the new Georgia O'Keeffe exhibition, which opened this weekend at the Shelburne Museum in Vermont. (4:10)