πTon/2 is a sound installation that features a flexible enclosed ring set in motion by the torsional motors inside its body. By twisting and waving on itself, the piece moves in with a natural but unpredictable pattern. Movements of the ring projects sounds sampled from a bass clarinet, and is diffused by the loudspeakers inside. When it moves slowly, its contractions and dilations produce sensual sounds similar to deep breaths. When movements turn fast and brutal, sharp sound is generated to fill up the room like a nervous flow.