Too short article/interview with Jane Jacobs:

New York still has so much pizzazz, because people make it new every day. Like all cities, it's self-organizing. People looking for a date on Third Avenue make it into a place full of hope and expectation, and this has nothing to do with architecture. Those are the emotions that draw us to cities, and they depend on things being a bit messy. The most perfectly designed place can't compete. Everything is provided, which is the worst thing we can provide. There's a joke that the father of an old friend used to tell, about a preacher who warns children, "In Hell there will be wailing and weeping and gnashing of teeth." "What if you don't have teeth?" one of the children asks. "Then teeth will be provided," he says sternly. That's it - the spirit of the designed city: Teeth Will Be Provided for You.