Walkable cities radiate an organic vibrancy. They have dense roots in neighborhoods of storied provenance, have complex zones of eclectic social and economic activity. City planners are beginning to see the virtues of these version–1.0 cities, metropolises that have more in common with the Paris of the Second Republic (minus the smog and the hordes of irredeemable poor) than the indifferent, anomic settlements of the American West.