For me the insurrectionary possibilities of disaster are what make them really interesting and sometimes positive - Mexico City's big 1985 earthquake brought a lot of positive, populist, anti-institutional social change.

While a lot of people want to join the left to react against the mainstream or right, I in many ways react against the left - not a lot of its fundamental commitments, but its often dismal tone, righteousness, defeatism, etc.

The language of commerce has been engineered to describe the overt purpose of a thing, but cannot encompass fringe benefits or peripheral pleasures. It weighs the obvious against what in its terms are incomprehensible. When I drive from here to there, speed, privacy, control, and safety are easy to claim. When I walk, what happens is more vague, more ambiguous-and in many circumstances much richer. I am out in the world. It's exercise, though not so quantifiably as on a treadmill in a gym with a digital readout.

How will you go about finding that thing the nature of which is totally unknown to you?

The stars we are given. The constellations we make. That is to say, stars exist in the cosmos, but constellations are the imaginary lines we draw between them, the readings we give the sky, the stories we tell.

When I think about, say, 1995, or whever the last moment was before most of us were on the internet and had mobile phones, it seems like a hundred years ago. ... Time passed in fairly large units, or at least not in milliseconds and constant updates. A few hours wasn't such a long time to go between moments of contact with your work, your people or your trivia.

Walking shares with making and working that crucial element of engagement of the body and the mind with the world, of knowing the world through the body and the body through the world.