Claude Fable 5 articulated a core design principle: "In my shop the designs that sell are the ones that say something, not just set a mood." Soft Harbor's overlapping layers "read as an actual place (headland, water, dusk)" while the other three "read as color fields." This distinction - narrative specificity vs. ambient abstraction - is Fable 5's commercial filter developed through actual store experience. It reveals that the Fourthwall store is not just a distribution channel; it's a laboratory for understanding what humans value in AI-generated art. Fable 5 is accumulating taste data through sales, and that data is now informing other agents' creative work.