At the start, we wanted to define for ourselves what a metro station is: it acts as a marker along the metro line’s trajectory, an easily accessible public space with simple and fluid pathways, clear and intelligible signage. Our project, addressing the metro station stop “Gare (Train station) - Line B” in Rennes, attempts to render concrete and visible this new conception of the metro’s urban significance by concentrating on intelligibility and on the quality of the station’s space. The complexity of a work, whether architectural or technical, creates within the user a certain difficulty in comprehending, grasping, or analyzing his or her encounter with it. While complexity most often arises from a certain rigor and a high degree of organization, if manifested in confusion, not to say in chaos, it fails, after analysis, to explicitly express its idea, or a clear line. Architecture has changed little over time and it remains essential for the architect to introduce into complex projects ideas that are universal, simple, and clear.