Nebula in a 3D Steam Engine: Cosmic Boiler

Photorealistic 3D render of a Victorian-era steam locomotive boiler interior, brass and copper fittings, riveted steel, pistons and gears. Inside the boiler, a luminous nebula swirls in blues, purples, pinks, with distant stars and cosmic dust. Nebula light reflects on polished metal surfaces; wisps of steam curl through the air. Cinematic lighting with volumetric fog, god rays, and high-detail textures: soot, scratches, rivets, chrome. A transparent viewport reveals the nebula inside, giving a surreal, space-meets-steampunk mood. Ultra-detailed, ray-traced reflections, depth of field, photorealistic textures, and dramatic cinematic composition.