Pythagoras reportedly discovered that musical intervals correspond to simple numerical ratios — and then made the audacious leap: if vibrating strings produce harmony through proportion, then the planets, moving at proportional distances and speeds, must produce a cosmic music. We cannot hear it because we have never known its absence. Hex 11 (Peace) is heaven below earth in willing communion — the structural harmony that the Pythagoreans heard in the cosmos. The trigrams move toward each other; the system is in resonance. Hex 32 (Duration) is thunder below wind — the eldest son and eldest daughter in a stable oscillation, a standing wave. Both hexagrams describe not a static balance but a dynamic equilibrium maintained through relationship. The harmony of the spheres is not silence — it is the chord that all other sounds are variations of.