Red Urchin is a musical sculpture that is played by placing your hands near any of its four antennas. The flexible antennas can be positioned in different configurations - adjusting to personal preference, allowing for multiple players, or even enabling it to respond to its environment without direct influence from a participant. The antennas are sensitive to changes in distance from your hand. One antenna controls the pitch of bass notes another controls tenor notes. The other two antennas alter the timbre of the sound being produced, each in a different way.