9937 / 18210 · Workshop 82 — Symmetrical Harmony and Harmonic Geometry: Diminished Cycles, Augmented Triads, Whole-Tone Motion, Major-Third Systems, and Escaping Ordinary Tonal Gravity← prev⊞ allnext →
82.3012 ÷ 3 = 4
Minor third = 3 semitones.
Four equal minor thirds complete octave.
Therefore diminished seventh chord has:
four-fold symmetry.