Shattuck and Stix:  Has the pace of changing technology made the purpose or meaning of particular cities, or cities in general, different for new generations, or is their essential character as places of concentrated choice something that you think remains relatively constant?

William Gibson:  The Internet, which I think of as a sort of meta-city, has made it possible for people who don't live in cities to master areas of expertise that previously required residence in a city, but I think it's still a faith in concentrated choice that drives migration to cities.