Paper CIX: The 3: 2 ratio is connected to the 7, 3 ↔ 3, 6 tiling interface: the vertex coordination number ratio Zₕyp/Zflat = 3/6 = 1/2 combined with the G₂ Weyl group action (which mixes the root lengths by a factor of 4/3 at the resonance point) gives 1/2 × 4/3 = 2/3. A complete derivation from G₂ geodesics on | Synapse