The Tschumipavilion is transformed into an instrument, that can be played by the audience, by means of a mobile phone. On the Tschumipavilion a telephone number is visible. When the number is called, TSCHUMIFOON will be activated. The instrument can be controlled and played with the keyboard of any mobile phone. Several instruments are connected to speakers. These instruments will start moving as soon as the caller activates the speakers. For an audience that loves to play, the Tschumipavilion will change into an acoustic and visual show.