Harmonic Intervals — Lissajous (lateral) & Rotary (concurrent / counter‑current)
Δ (open‑phase)
glow
grain
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open phase
closed phase
intervals
rotary — concurrent
rotary — counter‑current
lateral
Seeds: rational tone ratios; φ, e, π; epicycles & Lissajous — closure emerges when frequencies are commensurate. (Drag the Δ slider.)