To gather the concrète material for this piece I made a field recording of myself knocking on as many different surfaces as I could find in my house (walls, doors, cabinets, etc.) with a variety of implements (knuckle, fist, a piece of wood, etc.). These elements were then assembled into a periodic rhythm characterized by a few simple motives. Though the rhythmic motives are repeated, each 'note' is a unique event and has its own timbre, over 400 in all.

Added to this is material gathered by striking a variety of ceramic or glass objects, mostly tableware. To contrast with the knocking part, these were assembled into a few gestures and are the same every time they are heard.