The Harmony of the Spheres

The Pythagorean and Neoplatonic claim that the cosmos is tuned — that the intervals between planets are musical intervals, and that the universe is therefore literally, not metaphorically, a chord.

The forebear the Kabbalah inherited from its Greek cousins, and the reason number, letter and pitch keep collapsing into each other in this tradition. If creation is ratio, then a musical interval is a piece of cosmology you can hear. ⚠ Kepler is the honest end of this story rather than the mystical one: he spent decades on Harmonices Mundi looking for the chord, and the third law of planetary motion fell out of the search. The idea was wrong in the way that produces physics.