The building presents itself as a compact mass shaped by two rectangular volumes of black concrete. The blocks meet along an almost tectonic contact line, produced by a lateral thrust that organizes the whole. The concrete is pigmented using a ferric binder, with a dense matrix that absorbs light rather than reflecting it. The concert hall is integrated into this assembly as an acoustic core protected by a continuous mineral envelope. The load-bearing structure is based on a thick shear wall design, combined with a network of internal stiffeners that stabilize the long spans required for the suspended seating. The internal acoustics rely on sculpted panels of compressed mineral fibers, calibrated according to a parametric model that distributes the absorption and diffusion coefficients. The main entrance follows a longitudinal slit where the concrete reveals its aggregate size and formwork lines. The whole forms an architectural organism centered on density, pressure, matter and sound energy, with a tectonic writing that inscribes the building in a logic of mass rather than of facade.