But a house is not simply a machine for living in. There is a difference between a house and a home. The functions of a home are complex and the utility of a building depends not only on its design but on the reactions of those who live in it. The occupants of the Pruitt-Igoe scheme, like those of similar buildings, were alienated by the isolation of a living environment that saw no need for accidental, unplanned social interactions. They showed no respect for its public spaces. The functionality of the blocks proved, in the end, not to be functional.
Communities are complex organisms, imperfectly understood, and their functioning depends on their social relations. Great architects implicitly understand obliquity, but obliquity is so important to the design of towns that the most successful towns have no designer at all. The planned city was conceived in the late 19th century. Baron Hausmann swept away the jumble of Paris streets that had developed over the centuries to create grand boulevards. From the 1920s to 1968, the powerful, autocratic Robert Moses controlled the physical environment of New York, driving expressways through apartments, offices and factories
Source: Obliquity – John Kay