In a city established and sustained by immigrants, it is the subway that serves to epitomize the character of New York. Each speeding carriage acts as a microcosm of the teething metropolis above it; nowhere else in the world is it possible to find so many different cultures in such close proximity to one another. Just as the city's growth was once fueled by the mass migration of people from countless countries, its continuing prosperity relies on getting people to their destinations as quickly as possible. Circulation is the lifeblood of New York. The tower is a monument to movement, at the same time glorifying the technologically sublime with its slender grace.