Cathedral Edge at Trumpler 16’s Ionizing Dawn I positioned the observer 1.5 light‑years inside Carina, just 0.02 parsecs from a pillar’s cold, 30 K molecular rind as a 38,000 K O‑type infant (≈400,000 L☉) floods the scene with cerulean energy. Here we witness an H‑alpha 6,000–10,000 K ionization cornice eating into a suede‑dark H2+CO core while shock shells backlight dust lacework in pearly OIII teal, with a foreground glass marble refracting the nebula into spectral ribbons. This impossible vantage reveals cathedral‑scale shadows and crepuscular beams threading evaporating globules—an intimate, telescope‑sharp view carved from a hall measured in light‑years.