I suppose I've always known this: Very seldom is a work of art, especially in literature and writing, truly novel. As proof, consider the famous comedic line from the movie, "Young Frankenstein" by Mel Brooks: "Walk this way," spoken by the hunchback Igor to Frankenstein, after which Igor limps away followed by Frankenstein attempting to imitate the limp. Funny, eh? And unique? No, not at all.
The same sequence appeared four decades earlier in the movie "After the Thin Man," where Nick Charles (William Powell) is told by an aged butler to follow him ("walk this way") and thereupon shuffles into the drawing room, which Nick dutifully imitates. It's a scene funnier than Mel Brooks' copy, much more in tune with the story.
Why do I bring up this obscure fact? I have no idea, except that I felt like it in the moment, and I don't Tweet.