Placed in the Federal Plaza, the work bisected the space, blocking views and paths of those who frequented the plaza. Serra said of the design, "The viewer becomes aware of himself and of his movement through the plaza. As he moves, the sculpture changes. Contraction and expansion of the sculpture result from the viewer's movement. Step by step, the perception not only of the sculpture but of the entire environment changes." The steel is self-oxidizing and is designed to develop a natural rusted appearance over time.