Openhall turns up to 10 artworks into a walkable 3D gallery. AI curates the rooms, layout, wall labels, and a guided tour; deterministic code builds the space so it is always coherent. Walk it in first person (WASD + mouse), then export a self-contained website you can host anywhere — you own every file. BYOK: bring your IBM watsonx or OpenAI-compatible key; your key is never stored, not even in this browser. Open source, with a no-key demo gallery you can explore first.