by Stewart Brand, http://www.prospectmagazine.co.uk

Sixty million people in the developing world are leaving the countryside every year. The squatter cities that have emerged can teach us much about future urban living.

1983, architect Peter Calthorpe gave up on San Francisco, where he had tried and failed to organise neighbourhood communities, and moved to a houseboat in Sausalito, a town on the San Francisco Bay. He ended up on South 40 Dock, where I also live, part of a community of 400 houseboats and a place with the densest housing in California. Without trying, it was an intense, proud community, in which no one locked their doors. Calthorpe looked for the element of design magic that made it work, and concluded it was the dock itself and the density. Everyone who lived in the houseboats on South 40 Dock passed each other on foot daily, trundling to and from the…