Photographers often do their best work with subjects they know intimately. For at least nine professionals, that subject is their spouse. As exhibited in The Model Wife at The Art Institute of Chi-cago through May 6, the collaboration of artist and wife resulted in some powerful images, including those of Georgia O’Keeffe taken by Alfred Stieglitz, Charis Weston captured by Edward Weston, and Eleanor Callahan rendered by Harry Callahan. or (312) 443-3600