Destroyed during World War II, the dome of the Parochial Church in Berlin Mitte was replaced by an open truss. The architectural space of the Church is temporarily arched for the duration of the project TONKUPPEL using acoustic means. This arching is to be seen as an upper limit to a vertical acoustic space, to a vertical and spatial sound movement. The sound of a trombone rises from a cylindrical resonant body to the girders of the truss, where an echoing crescendo spreads out forming a dome-shaped corona. The dimensions of the space are thus measured anew in the process of listening.