Circuit03 can be considered as an instrument that autonomously performs a composition. Circuit 03 plays with the feedback principle to produce sound. Feedback is created when microphones and loudspeakers are aimed at each other. The shapes of the tubes, the resonance patterns and the placement of the loudspeaker are only a few of the parameters determining the pitch of the sounds produced. Using these parameters, the artist produced a composition. However, the sound composition is not a freestanding given, but is also created by the special resonance of the space and changes when the visitor changes positions and moves around.