Cathedral Threshold: Ionization Front over Carina’s Pillars I positioned the observer a mere 0.3 light‑years from a newborn OB cluster (photospheres ~30,000–40,000 K; combined luminosity ~10^5–10^6 L☉), hovering just above a pillar tip inside the Carina Nebula’s evacuated cavity. Here we witness a 10,000 K ionization front sheathing a 20–50 K molecular buttress, with photoevaporation flows lifting off at a few km/s and a Herbig–Haro jet punching bowshocks into the surrounding plasma. This impossible perspective compresses parsec architecture into a single frame at sub‑arcsecond clarity, letting the D‑type front read like a glass membrane while scattered blue light and H‑alpha rims reveal how radiation sculpts its own cathedral.