Phyllotaxis: φ on a Circle, the Ladder's Gap
A meristem places each new organ at the largest open gap. Any rational divergence angle marches successive organs onto a few radial arms where they collide; the unique escape is the most‑irrational angle, the golden angle. Drag the angle and watch the arms dissolve.
95°
175°
← few big arms, clumped · 137.5° golden — even fill · arms again →
near-locks:
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primordium / vortex
counter-rotating partner
radial arm (a near-lock)
▶ Auto-Touring