Today I’m thinking of an old poem: “Kubla Khan; or, A Vision in a Dream: A Fragment,” written by Samuel Taylor Coleridge in 1797. I’m also thinking of an even older poem: the Book of Revelation.

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(Perhaps I should apologize to those whom the title of this post fooled into expecting a clip from “Xanadu,” the 1980 roller-disco movie featuring Olivia Newton-John and Gene Kelly. But I’ll try to do something with that movie next week!)