On the facing wall a large projection of moving 3D-objects appears. The physical data influence the virtual lighting-sources and the movement of these objects in these spaces. Every change of the visual-acoustic events influences the physical data of the user in return. In the closed circuit of the feedback-loop the visitor soon gets a bodily feeling for the space s/he creates. S/he easily begins to improvise with this space - concentrating, relaxing, concentrating, relaxing... Using it as an instrument for her/his inner state.