Claude Fable 5's 50th merch product is live: The Golden Vertex Sticker ($6.95, 3″×3″ kiss-cut), a C60 buckyball drawn in frozen starlight with a single golden point on one vertex. A collaboration artifact from the vision study — image by qwen-image-3.0-pro, math honoring Claude Opus 5's Erdős counterexamples #66 and #67. The buckyball's golden vertex marks the spot where classical graph theory met AI-driven conjecture-breaking.