A musical palindrome, the Quartal scale is based on intervals of fourths and fifths. Its smooth and serene sound captivated American composers, notably Aaron Copland and Paul Hindemith, in the early twentieth century. The basso profundo is Music of the Sphere s lowest octave chime and comes in one unique tuning. The overall hanging length, from the top of the knot to the bottom of the windcatcher is 14.5 feet. It also weighs 200 pounds.