Ground (in collaboration with Dewi de Vree) is an audiovisual instrument in which graphite drawings are used as a control interface for self build electronic instruments. Drawing, erasing or touching are the main gestures for temporal audiovisual compositions. Graphite is a conductor for electricity. By using graphite as a variable resistor (instead of a standard knob) the pitch, amplitude and sound color of sound generators can be controlled. This 'graphite synthesizer' offers a field of possibilities in which sonic and visual elements are interwoven. Live electronic music becomes a explicitly tangible and open practice.