Note that Mortal Engines—that steampunk movie with the mobile, carnivorous cities—was released halfway between the original publishing of this essay and today.
Given the difficulties people have mentioned with moving high-density housing between and through cities, maybe we need small cities on SMTs ?
I built a thing.
UVC lamps deactivate viruses in the air, but harm skin, eyes, and DNA. So I made a short duct out of cardboard, with a 60W UVC corn bulb in a recessed compartment, and put a fan in it.
I plan to run it whenever someone other than my wife and I visits my house.
https://imgur.com/a/QrtAaUz