A native of the capital of Catalonia, the architect-urban planner, to whom we owe the Saint-Honoré market in Paris and the Donnelley Building in Chicago, speaks of Barcelona with infectious passion. "It's a unique city, difficult to understand with conventional diagrams, he explains, criss-crossing the main arteries of the city". It is an unfinished city, constantly changing, where everything has the charm of the unfinished". With a sharp eye, Ricardo Bofill observes and comments on volumes and scrolls. Standing, in the nave of the Sagrada Familia, arms outstretched, it pivots on itself as if to take in space. "You have to have your eyes wide open, move quietly, and at the same time remember what's behind. This is how we have the sense of space. Otherwise this art does not exist."