4-audio-channel copper foil on marbled paper. The copper design carries audio signal which is activated by the magnet attached to the band on the hand of the participant. By placing the hand near the paper, sound is generated at that location. The specific sound generated depends also on where in the design the interaction takes place. There is no external speaker or sensors. The interaction, gesture, and sound is colocated on the surface of the circuit print.
This documentation video starts with a still of the circuit print, and then demonstrates the interactivity and sound of the piece. The sound in the copper circuitry is from recordings of "number stations" (AM radio band spy transmissions), highlighting the sense of the paper as holding a secret message which can be uncovered through interaction.