But the simplest and most radical thing that Ridley Scott did in Blade Runner was to put urban archaeology in every frame. It hadn’t been obvious to mainstream American science fiction that cities are like compost heaps—just layers and layers of stuff. In cities, the past and the present and the future can all be totally adjacent. In Europe, that’s just life—it’s not science fiction, it’s not fantasy. But in American science fiction, the city in the future was always brand-new, every square inch of it.
Cities seem very important to you.
Cities look to me to be our most characteristic technology. We didn’t really get interesting as a species until we became able to do cities—that’s when it all got really diverse, because you can’t do cities without a substrate of other technologies. There’s a mathematics to it—a city can’t get over a certain size unless you can grow, gather, and store a certain amount of food in the vicinity. Then you can’t get any bigger unless you understand how to do sewage. If you don’t have efficient sewage technology the city gets to a certain size and everybody gets cholera.
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