 Root was one of the builders of the Monadnock Building (see above).That and another Root design, the Masonic Temple Tower (both in Chicago), are cited by many as the originators of skyscraper aesthetics of bearing wall and column-frame construction, respectively.In 1890 Sullivan was one of the ten U.S. architects, five from the east and five from the west, chosen to build a major structure for the "White City", the World's Columbian Exposition, held in Chicago in 1893.