Szukalski who were tied to the "Chicago Renaissance" helped to fashion the city into a nexus for new trends in art. Chicago has long had a strong tradition of figurative surrealism, as in the works of Ivan Albright and Ed Paschke. In 1968 and 1969, members of the Chicago Imagists, such as Roger Brown, Leon Golub, Robert Lostutter, Jim Nutt, and Barbara Rossi produced bizarre representational paintings. Today Robert Guinan paints gritty realistic portraits of Chicago people which are popular in Paris, although he is little known in Chicago itself. These same impulses also appeared in Chicago's lively street photography scene, gaining notoriety through artists centered around the Institute of Design such as Harry Callahan, Aaron Siskind, as well as in the work of nanny-savant Vivian Maier. Bob Thall's beautiful, bleak photographs of Chicago-area architecture have also won much acclaim. Chicago has a Percent for Art program of public artworks, although it is notoriously more opaque and secretive than that of most other cities; arts activist such as Paul Klein and attorney Scott Hodes have long criticized its lack of public accountability. Chicago is home to a number of large, outdoor works by well-known artists. These include the Chicago Picasso, Miró's Chicago, Flamingo and Flying Dragon by Alexander Calder, Monument with Standing Beast by Jean Dubuffet, Batcolumn by Claes Oldenburg, Cloud Gate by Anish Kapoor, Crown Fountain by Jaume Plensa, Man Enters the Cosmos by Henry Moore, Agora by Magdalena Abakanowicz, Fountain of Time by Lorado Taft, and the Four Seasons mosaic by Marc Chagall. Architecture The central part of Chicago was largely destroyed by the Chicago Fire in 1871. Almost all the buildings currently standing in the city's downtown area were built after that, one exception being the Chicago Water Tower. Around the turn of the twentieth century, Chicago was a key location in the development of the skyscraper. This movement was spearheaded by architects promoting the Chicago School design philosophy, including Louis Sullivan and others. Notable tall buildings and skyscrapers built before the mid-1930s include the Rookery Building, the Auditorium Building, the Chicago Cultural Center, the Monadnock Building, the Reliance Building, the Sullivan Center, the Marquette Building, the Chicago Building, the Wrigley Building, Tribune Tower, the London Guarantee Building, 333 North Michigan, the Jewelers' Building, the Palmolive Building, the Carbide & Carbon Building, Riverside Plaza, the Merchandise Mart, and the Chicago Board of Trade Building. In the 1940s,