Walker Evans (1903-1975) was one of the most important of twentieth-century American photographers. His photographs of the Depression years of the 1930s, his assignments for Fortune magazine in the 1940s and 1950s, and his "documentary style" influenced generations of photographers and artists. His attention to everyday details and the commonplace urban scene did much to define the visual image of 20th-century American culture. Some of his photographs have become iconic. Conceived as a retrospective of Evans's work as a whole, the Centre Pompidou exhibition presents three hundred vintage prints in a novel and revelatory thematic organisation. It highlights the photographer's recurrent concern with roadside buildings, window displays, signs, typography and faces, offering an opportunity to grasp what no doubt lies at the heart of Walker Evans' work: the passionate quest to identify the fundamental features of American vernacular culture. In an interview of 1971, he explained the attraction as follows: "You don't want your work to spring from art; you want it to commence from life, and that's in the street now. I'm no longer comfortable in a museum. I don't want to go to them, don't want to be 'taught' anything, don't want to see 'accomplished' art. I'm interested in what's called vernacular. For example, finished, I mean educated, architecture doesn't interest me, but I love to find American vernacular". In the English-speaking countries, and in America more notably, the term "vernacular" designates those popular or informal forms of expression used by ordinary people for everyday purposes -- essentially meaning all that falls outside art, outside the recognised networks of production and legitimation, and which in the US thus serves to define a specifically American culture. It is all the little details of the everyday environment that make for "Americanness": wooden roadside shacks, the way a shopkeeper lays out his wares in the window, the silhouette of the Ford M