Previous technologies have expanded communication. But the last round may be contracting it. The eloquence of letters has turned into the unnuanced spareness of texts; the intimacy of phone conversations has turned into the missed signals of mobile phone chat ... ('you're breaking up' is the cry of our time).

Perhaps walking is best imagined as an 'indicator species,' to use an ecologist's term. An indicator species signifies the health of an ecosystem, and its endangerment or diminishment can be an early warning sign of systemic trouble. Walking is an indicator species for various kinds of freedom and pleasures: free time, free and alluring space, and unhindered bodies.

Walking articulates both physical and mental freedom.

Globally, as the nation-state becomes increasingly less meaningful - a provider of positive goods and more and more just an army and some domestic enforcement - people are withdrawing to shape and support more localised forms of organisation and power. To the extent that it's part of that civilised and localising world, the same is true of the U.S.

An aptitude test established architecture as an alternative [career]. But what decided the matter for [Teddy Cruz] was the sight of a fourth-year architecture student sitting at his desk at a window, drawing and nursing a cup of coffee as rain fell outside. 'I don't know, I just liked the idea of having this relationship to the paper and the adventure of imagining the spaces. That was the first image that captured me.

Revolution is as unpredictable as an earthquake and as beautiful as spring. Its coming is always a surprise, but its nature should not be.

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.