We designed a co-working space and coffee stand in Nihonbashi, Tokyo, with the concept of "Entrance to the blue planet". Even if we were to express nature itself in the space, it would only be fake. In order to create a real connection with nature, we thought about what nature is in this place. We focused on the fact that this floor was slightly lower than ground level, and considered the part below ground level to be "underground". The design evokes the idea that even in Tokyo, which is covered in concrete, there is living soil beneath a few centimeters of pavement, and that the ground is also enveloped in a larger part of the atmosphere. We tried using the backside of tiles to express that soil. The idea was to reuse tiles, which are discarded by the tons every day. The backside of the tiles is not colored, so it is the raw material of baked soil. By turning it into a tile, it becomes abstract. Above ground level, cedar boards are used in a louvered shape as an abstraction of trees, and on the walls, gradations as expressions of the sky and atmosphere give depth to the space.