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Photo of Hoshikusokan, the obsidian mine display room, situated in the woods on the mountain-side above the Kokuyōseki Taiken Museum (Obsidian Experience Museum) in Nagawa Town, Nagano Prefecture, Japan. A path covered with fallen leaves leads to a building partially obscured by the trees of a wood. The building is about 2 storeys high in the shape of a rectangular prism with its longest dimension resting on the ground. Near one end of the building can be seen a dark, rectangular entrance. The building is grey, but intentionally discoloured with red-brown rust.