RUMTUM UV-Reactive Mural
RiNo is wall-to-wall murals, but this RUMTUM piece has a second painting hiding inside it that daylight never shows. The artist worked UV-reactive elements into the design, so the concealed imagery only appears after dark under a blacklight, and basically nobody walks the murals carrying one. Show up at night with a cheap UV flashlight and the wall changes into something else entirely. It lives on a quieter stretch of Walnut, in the alley between 28th and 29th.
The move: Bring a small blacklight/UV flashlight and go after dark: walk the Walnut alley, find the RUMTUM wall, then kill the phone lights and watch the hidden imagery glow into view together.
- 📍 RiNo (River North Art District)
- 💸 Free
- ⚡ Low-key
- 🌗 Outdoors
Where: RUMTUM mural, Walnut St alley between 28th and 29th, Denver (RiNo); near the 2555 Walnut St vicinity
Hours: Outdoor public mural, accessible anytime, but the hidden UV effect only works after dark, so go at night and bring your own blacklight. Murals can be repainted over time.
Plan a visit & invite your people →
Verified 2026-06-07.