"So you get the Tribes. People all over the world who are really secret agents for some other time zone, some other way of looking at the world, some other zeitgeist. Unlike other tribes, you can change allegiance by doing nothing more that resetting your alarm clock. Like any tribe, they are primarily loyal to each other, and anyone outside of the tribe is only mostly human. That may sound extreme, but this is what it comes down to.

Tribes are *agendas*. Aesthetics. Ethos. Traditions. Ways of getting things done. They're competitive. They may not all be based on time-zones. There are knitting Tribes and vampire fan-fiction Tribes and Christian rock tribes, but they've always existed. Mostly, these tribes are little more than a sub-culture. It takes time-zones to amplify the cultural fissioning of fan-fiction or knitting into a full-blown conspiracy. Their interests are commercial, industrial, cultural, culinary. A Tribesman will patronize a fellow Tribesman's restaurant, or give him a manufacturing contract, or hire his taxi. Not because of xenophobia, but because of homophilia: I know that my Tribesman's taxi will conduct its way through traffic in a way that I'm comfortable with, whether I'm in San Francisco, Boston, London or Calcutta. I know that the food will be palatable in a Tribal restaurant, that a book by a Tribalist will be a good read, that a gross of widgets will be manufactured to the exacting standards of my Tribe.