Walkers are 'practitioners of the city,' for the city is made to be walked. A city is a language, a repository of possibilities, and walking is the act of speaking that language, of selecting from those possibilities. Just as language limits what can be said, architecture limits where one can walk, but the walker invents other ways to go.

Leave the door open for the unknown, the door into the dark. That’s where the most important things come from, where you yourself came from, and where you will go.

There are disasters that are entirely manmade, but none that are entirely natural.

In great cities, spaces as well as places are designed and built: walking, witnessing, being in public, are as much part of the design and purpose as is being inside to eat, sleep, make shoes or love or music. The word citizen has to do with cities, and the ideal city is organized around citizenship -- around participation in public life.

Stories are compasses and architecture, we navigate by them, we build our sanctuaries and our prisons out of them, and to be without a story is to be lost in the vastness of a world that spreads in all directions like arctic tundra or sea ice.

More and more I think of privatisation as being not just about the takeover of resources and power by corporate interests, but as the retreat of citizens to private life and private space, screened from solidarity with strangers and increasingly afraid or even unable to imagine acting in public.

The fight for free space-for wilderness and for public space-must be accompanied by a fight for free time to spend wandering in that space. Otherwise the individual imagination will be bulldozed over for the chain-store outlets of consumer appetite, true-crime titillations, and celebrity crises.