... Now that it had happened, he could see that it had to. The world of Walden was at the very peak of human culture. It had arrived at so splendid a plane of civilization that nobody could imagine any improvement—unless a better tranquilizer could be designed to make it more endurable. Nobody ever really wants anything he didn't think of for himself. Nobody can want anything he doesn't know exists—or that he can't imagine to exist. On Walden nobody wanted anything, unless it was relief from the tedium of ultra-civilized ... — The Pirates of Ersatz • Murray Leinster