Here’s a brief introduction from the MIA:
O’Keeffe’s exploration of abstraction placed her at the forefront of the American avant-garde. While most retrospective exhibitions of O’Keeffe’s art begin, appropriately, with her breakthrough abstract charcoal drawings of 1915, the fact that she continued to paint in this mode throughout her career is almost always overshadowed by the popularity of her more representational canvases. Like many of her peers, she took daring risks as she worked, experimenting adventurously with color, scale, and composition. What truly distinguished O’Keeffe from her contemporaries, however, was her innovative and consistent approach to abstraction: an approach rooted not in esoteric theories and rigid, grid-oriented geometry, but rather in a highly personal interpretation of her subject matter that she consistently realized through a unique vocabulary of circular forms.
Also on the site is a slideshow with audio from curator Sue Canterbury.