For me, being in a car or on an airplane is like being in limbo. It's this dead zone between two places. But to walk, you're some place that's already interesting. You're not just between places. Things are happening.

Everywhere people are at work to build a better world in which we - and some of the beauty of this world - will be guaranteed to survive. Everywhere they are at war with the forces threatening us and the planet.

Sometimes a few passionate people change the world; sometimes they start a mass movement and millions do.

In her novel Regeneration, Pat Barker writes of a doctor who 'knew only too well how often the early stages of change or cure may mimic deterioration. Cut a chrysalis open, and you will find a rotting caterpillar. What you will never find is that mythical creature, half caterpillar, half butterfly, a fit emblem of the human soul, for those whose cast of mind leads them to seek such emblems. No, the process of transformation consists almost entirely of decay.

Solitude in the city is about the lack of other people or rather their distance beyond a door or wall, but in remote places it isn’t an absence but the presence of something else, a kind of humming silence in which solitude seems as natural to your species as to any other, words strange rocks you may or may not turn over.

Growing up north of San Francisco, I immersed myself in the local landscape and in books about Native Americans, cowboys, and pioneers that seemed to ground me in it, but to pursue culture in those days meant being spun around until dizzy and then pushed east.

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.