The M Hotel is a hotel in Manhattan with the theme of Subway, where is a raw, industrial environment. The brass pattern on the floor symbolizes the complex trails and the signal of circulation. The metal ceilings and lighting fixtures which controlled by an AI system reflect the people's movement under them. In this case, the light, shadow, and reflection of the users make the interior space changing all the time. This hotel shows the real experience of the subway translated to aesthetic modern hotel life.