A confluence of technology (the elevator), social change (the increase in the number of office workers), and geology (a downtown limited in area by surrounding water) transformed New York City from an expanse of low buildings to a forest of skyscrapers. Landau, an art history professor at New York University, and Condit, a professor emeritus of art history at Northwestern, explore the development of the skyscraper from the 1868 Equitable Building, the first to use elevators for people rather than freight, to the Woolworth Building, which was called the "Cathedral of Commerce" and for which President Woodrow Wilson traveled to New York to activate the building's lights during its grand opening.