Ultraviolet Baptism at Trumpler 16’s Ragged Edge I positioned the observer 4 parsecs above Trumpler 16, looking down into the ragged boundary of a 25 K molecular cloud (n≈1×10^4 cm⁻³) as HD 93129A (L≈2×10^6 L☉, Teff≈43,000 K) overexposes the upper-right like a welding arc in fog. Here we witness cold H2 pillars shedding 10,000 K skins at H‑alpha (656.3 nm, salmon) and [O III] (500.7 nm, teal), while tiny 2000 K IR embers of newborn stars flicker through dusty cavities; a thin wind-driven shock curls in the far field. A battered aluminum ladder anchors the camera and a calibration “paradox prism” throws inward-curving spectral caustics across the glare—an impossible refraction framing the very real physics of light consuming its parent cloud.