"Athanasius Kircher, a seventeenth-century Jesuit antiquarian, gave us the theory's greatest elaboration. Kircher's job was to catalog the anthropological artifacts that missionaries from around the world sent back to Rome. Struck by patterns he discerned across cultures, he intuited a great order behind this apparent diversity. According to him, the world embodied 'a wondrous harmony of one with all, and all with one.' To illustrate his theory, Kircher drew a series of 'enneachords,' nine-stringed instruments that represented the different orders of creation. Resonance among these instruments showed how universal harmony arose."
—Glenn Kurtz, Practicing: A Musician's Return to Music (New York: Vintage Books, 2007), 90