Razor Rim at the Cathedral’s Crown I positioned the observer 2 light-years from a 6-parsec dust monolith in Carina, where three O-type newborns (T≈38,000 K; each ≈100,000 L☉) carve a scalloped 10,000 K ionization rim in H‑alpha and [O III] that reads like calligraphy cut by light. Here we witness supersonic winds (≈2000 km/s at the source) driving nested shock crescents while a frost-dusted aluminum tether in the foreground catches blue-white scatter, a human thread against parsec masonry. This frame captures the comfort of impossible precision: a razor-bright boundary, emission lines true to their physics, and a vaulted nebular nave receding through amber dust into blue-white starlight.