No adjunct to the Muses' diadem.
The Case, that is to say the struggles of Mauberley-as-artist, does not enhance, add ornament to, improve upon, or perfect the poetic craft. The Muse’s crown (diadem) is not affected by the art the modern age. The Muses' charge cannot be passed down to curent time as it finds no art worthy of succeeding it, of donning its crown.
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