People must take a modicum of public responsibility for each other even if they have no ties to each other.

A region is an area safely larger than the last one to whose problems we found no solution.

When we deal with cities we are dealing with life at its most complex and intense. Planners are guided by principles derived from the behaviour and appearance of suburbs, tuberculosis sanatoria, fairs and imaginary dream cities - from anything but cities themselves.

One of our troubles is that we try to make municipalities that are totally different from each other all act as if they were the same kind of creature, with the same kinds of possibilities.

You can neither lie to a neighbourhood park, nor reason with it. 'Artist's conceptions' and persuasive renderings can put pictures of life into proposed neighbourhood parks or park malls, and verbal rationalizations can conjure up users who ought to appreciate them, but in real life only diverse surroundings have the practical power of inducing a natural, continuing flow of life and use.

Cities never flourish alone. They have to be trading with other cities. My new hypothesis shows why. But also in trading with each other they can't be in too different stages of development, and they can't copy one another.

You don't get new products and services out of sameness.