A violin bow strung with copper strings produces tones when stroked on the skin. Being a conductor by nature, it becomes an electrodedermal musical interface.
The human skin is the most sensitive part of this instrument. Due to its conductance reactions, there is a natural limit to regulating the modulation of sounds. The musician has only as much control over the instrument as she has over her own body and its affective responses. Yet the playing on the skin is also a form of scanning one’s body and ultimately an interaction with oneself.
When the copper strings come into contact with the skin a circuit is closed which in turn generates sound. The small changes of the skin's conductibility modify the sounds in pitch and volume.
More specifically, the tones are modified by
varying the pressure of the bow on the skin
playing on different areas of the body's skin
the changing of conductibility caused by perspiration (nervousness etc.)
sensors attached to the right hand which close further circuits and therefore allow for additional musical effects