As a writer with an unruly muse, I’ve gotten used to accepting inspiration no matter the quarter from which it arrives. Even for me, though, this essay is a little odd. We’re going to be talking about one of the weirdest movies of the early 1970s, which is of course saying something; about a widely praised short story by a major science fiction author from the same era; and about what these two products of the same cultural movement ha...