The Barcelona International Convention Centre consists of a large hall (15.000 m2, 80m of structural lighting) that can be divided and a block for associated services that looks out to sea. The hall is both structure and abstraction; the exterior block talks to the sea and the sky. The structure is a musical score of reference. The climate, the light (and opposite, shade) and sound (and its opposite, silence) have shaped the plot. The flows (of people and of fluids that are all similar), the masses and the architecture that appears (and frequently) disappears amid them.