The base and rack are Plexiglas. The resonating box, including the thin soundboards, is redwoo
University of Wisconsin. Rebuilt at the University of Illinois.
Harmonic Canon I has two planes of 44 strings each. The planes intersect near the middle of each string and thus the player may play on either plane or both at once. Also a moveable pyrex rod controls the pitch on some strings in one plane. The harmonic canons are both melody instruments and as providers of the harmonic underpinning, hence its name, canon, used in the sense of law. It is played with picks or fingers and is strikingly used in cascades of pitches.