Publication scope: The axes, rotations, unit-edge geometry and completion rule are supplied. Playback is illustrative, not physical time or an automatic quotient. No particle identity or measured parameter is established.

Unit-edge construction: equilateral triangle ABC + leg AD, body rotation 60°, leg rotation arccos(−⅓) ≈ 109.47°. Closure adds full-length BD and CD from B → A → D and C → A → D. Every structural edge has length 1; grid, axes and traces are visual guides. Each solid edge carries two directed packets. Violet traces show past presentations. The axes and completion rule are supplied; “many:1” here displays frame-compatible configurations, with no automatic quotient. Playback duration is illustrative. Three.js · MIT