'..much has happened in photography that is sensational, but very little that is comparable with what Stieglitz did. The body of his work, the key set - I think - is the most beautiful photographic document of our time.' Georgia O'Keeffe 1978 The photographs Alfred Stieglitz [1864-1946] took around his summer house at Lake George, New York state, USA after 1915 are considered a major departure and dramatically influenced the course of photography. The desire to build a specifically 'American' art led Stieglitz to explore the essential nature of photography, released from contrivances and from intervention in print and negative. 'Photography is my passion. The search for truth my obsession,' he would write in 1921. This major exhibition is the first in Australia of Stieglitz's photographs. 150 are included and are amongst the very best Stieglitz ever printed. They are also the rarest. One third of the exhibition is being lent by the National Gallery of Art, Washington DC, which holds 'the key set' – selected by his lover, muse and wife, the artist Georgia O'Keeffe, and deposited there after Stieglitz's death.