The multifunctioning building in its extreme form becomesthe Ponte Vecchio or Chenonceaux or the Futurist projects of Sant' Elia. Each contains within the whole contrasting scales of movement besides complex functions. Le Corbusier's Algerian project, which is an apartment house and a highway, and Wright's late projects for Pittsburgh Point and Baghdad, correspond to Kahn's viaduct architecture
and Fumihiko Maki's "collective form." All of these have complex and contradictory hierarchies of scale and movement, structure, and space within a whole. These buildings are buildings and bridges at once. At a larger scale: a dam is also a bridge, the loop in Chicago is a boundary as well as a circulation system, and Kahn's street "wants to be a building."