SU-Bahn Sonicography presents an interactive sound installation in which visitors are invited to explore physical channels in the piece's surface with their finger tips. The shapes and arrangement of these channels has been inspired by a stylized map of the Berlin transport network and its musical inspiration from the ideas of interdependence within an internally dynamic yet globally equilibrius system. This piece continues my work exploring interdependence in the sonic realisation resulting from multiple interactions with the piece. The interdependent nature of control creating a social music making environment. The metaphor being applied is that the musical outcome will represent the equilibrium state resulting from all forces (interactions) acting upon the device. The number of musical possibilities resulting from a such a system can be huge, therefore this will be an instrument that remains enigmatic to the visitor and one that will resist swift reduction as a simple analogue electronic device.