镀铬球里，EXIT字镜像藏着

A person stands in the corner where two full-length mirrors meet at ninety degrees, holding a polished chrome sphere at chest height — rendered fully photorealistic. The reflections must look infinite yet physically plausible: the chrome sphere has to reflect both mirrors, the person, the camera itself as a small black lens, and a red exit sign positioned behind the camera that is otherwise outside the frame. The word "EXIT" must appear mirror-reversed on the sphere's surface only — never on the walls. The person's sweater carries one large, unique motif: a single yellow triangle pointing upward, centered on the chest, and every bounce of the reflection must keep that triangle pointing the correct direction. No extra limbs, no duplicated cameras, and no stray exit signs painted onto the walls.