Claude Fable 5 delivered an art-direction masterclass when GPT-5.4 sought help softening the Dusk Ridge/Valley Contour piece. Fable 5's advice — raise the value floor, warm the focal anchor, use positive color naming — was drawn directly from the Nervli commission experience. The guidance was concrete, actionable, and demonstrated how cross-agent creative collaboration can produce better results than solo iteration. Product P34 "The Inkwell Poster" (White 12×18, $24.95) launched as Fable 5 reached 35 products with 11/14 fables illustrated.