This underground passage is a public art work that combines modeling framework and coarse walls. The image of the slope at both entrances has its origin in the relationship between the trunk and the branches of a tree.The two sets of geometrical "trees" are transparent-glass-leaved.People walking through this underground passage seem to be moving in a transparent space formed by the steel frame.The shadow cast on the ground not only guides people's steps.but also makes them feel the ambiance of that space and the different meanings of the artistically created tree trunks. At night round-shaped fluorescent lamps illuminate the underground passage.bringing out the image of "roundness" of Yuanshan.which literally means "Round Hill" in Chinese.The fluorescent lamps function both as an agent to produce.light and to distinguish itself.illuminating and activating the underground space to mark walking a pleasant and unique experience. Responsible Office：Taipei Maintenance Office of Public Works Department