Nearly 700 photographs from Eadweard Muybridge's groundbreaking publication Animal Locomotion, acquired by the Corcoran Gallery of Art in 1887, became the foundation for the institution's early interest in photography. The Key Set of more than 1,600 works by Alfred Stieglitz, donated by Georgia O'Keeffe and the Alfred Stieglitz Estate, launched the photography collection at the National Gallery of Art in 1949. Inspired by these two seminal artists, Muybridge and Stieglitz, the exhibition brings together highlights of the recently merged collections of the Corcoran and the National Gallery of Art by a range of artists from the 1840s to today. The connections between the two photography collections will be explored through five themes—movement, sequence, narrative, studio, and identity—found in the work of the two founding photographers.