a modernist Second Chicago School of architecture emerged from the work of Ludwig Mies van der Rohe. Buildings that he designed include 860–880 Lake Shore Drive, Crown Hall, 330 North Wabash, and the Kluczynski Federal Building. The tallest buildings in Chicago are Willis Tower, Trump Tower, the St. Regis Chicago, the Aon Center, and the John Hancock Center. Willis Tower was originally named Sears Tower, and was the tallest building in the world from 1973 to 1998. It is now the third-tallest building in the United States, after One World Trade Center and Central Park Tower, though the height to the roof of Willis Tower is greater than that of One World Trade Center. Other architecturally significant modern and postmodern skyscrapers in Chicago include the Inland Steel Building, Marina City, Lake Point Tower, the CNA Center, 333 Wacker Drive, the Crain Communications Building, the Thompson Center, the Harold Washington Library, and Aqua. The Prairie School of architecture originated in Chicago, which is home to a number of buildings by Frank Lloyd Wright and other Prairie School architects. Examples include Robie House and the First Congregational Church of Austin. The Pullman District was the first planned industrial community in the United States. Some neighborhoods in the city have many Chicago bungalow houses. Built mostly between 1910 and 1940, these single-family homes are narrow, -story brick structures, with gables parallel to the street. Literature Early writers associated with Chicago include Theodore Drieser, Eugene Field, Hamlin Garland, Edgar Lee Masters, and Frank Norris. Poets have included Gwendolyn Brooks and Carl Sandburg. Other notable writers often associated with the city's literary tradition include Nelson Algren, Saul Bellow, John Dos Passos, James T. Farrell, Lorraine Hansberry, Ernest Hemingway, Upton Sinclair, Studs Terkel, and Richard Wright. Public attractions Popular public attractions in Chicago include the Museum of Science and Industry, the Field Museum of Natural History, Adler Planetarium, Shedd Aquarium, Lincoln Park Zoo, the Chicago History Museum, Millennium Park, and Navy Pier. The city has a number of art museums, of which the two largest are the Art Institute and the Museum of Contemporary Art. One weekend each August the city hosts the Chicago Air & Water Show, a free exhibition on the shores of Lake Michigan. Flag and municipal device The flag of Chicago consists of four red stars and two blue stripes on a white background. The stars represent events in the history of