Volumetrically emphatic and silent, this convention center forms part of the base which maintains the monumental profile of the city. A solid body and an airy one give shape to the project. The first of them, a box inside another box, opens with great segmental arches. The second is composed in one part of a volume defined by a boundary of columns supporting a roof, and in another of an enclosed outdoor space with two face-to-face wedges of stands. Topping off the auditorium is the most emblematic element of the set: a portion of sphere perforated with an oculus and separated from the walls by luminous fissures, among which it seems to float weightlessly. Yet the conciliatory mood is not abandonned; the great airy and light shell is hidden inside the solid prism so as not to compete with neither the domes of the churches nor their towers.