One of the things that's influenced me recently is Edward Said's "On Late Style" (which I didn't finish, but got the gist of). It's basically an analysis of the high-culture equivalent of jumping the shark.
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The tldr as I understood it, is an "aging" process for creative work
1. A style reaches a maturity plateau, where its paradoxes become clear
2. You recognize this and persist anyway, producing fatally flawed virtuoso baroque works
3. Your work looks like horcrux-making
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I thought "late style" generally referred to the more austere, purgative style of, say, the late Wallace Stevens. (Goethe was more baroque.)
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