The «Sound-Space TU Berlin» is a permanent, sound installation located in the main building of the Technical University of Berlin. In a cube-shaped passageway cum room in which three corridors meet, Leitner built a sound-absorbing covering, with 42 hidden speakers distributed over the wall surfaces. Leitner sees the space as an electronic instrument from which an immaterial architecture can be retrieved using complex, programmed compositions. In the process, he liquefies architectural qualities such as proportion, tension and weight, by making these characteristics temporal and flexible. In the reverse, the constructional coordinates offer the structures for a musical event.