Here, the city’s functions are stacked on top of one another, freeing themselves from constraints and recreating land on the fringes of railway infrastructure and jutting out over it. The concrete-and-steel structure developed to meet these aims connects the upper section (Vinci HQ) to the lower section (the station). The two programmes are thus interwoven and interdependent: one can’t exist without the other, and the former serves the latter. The development is anchored in the city in a variety of different ways and Vinci HQ embraces all the scales of the metropolitan area, addressing the way the Metro system relates to the surface and the way the geography of Greater Paris relates to the sky.