How can we pervasively transform all of architectural space, so that every surface is rendered capable of displaying and collecting visual information? We start with the I/O Bulb, a conceptual evolution of the ordinary lightbulb: one which not only projects high-resolution information, but which also simultaneously collects live video of the region onto which it is projected. The Luminous Room results when we seed an enclosed space with a multiplicity of coordinated I/O Bulbs: enough, specifically, so that every location is treated by at least one I/O Bulb. "Urp" is a new I/O-Bulb-mediated urban planning workbench; here, simple architectural models cast accurate shadows, pedestrian-level wind patterns can be observed for different arrangements of buildings, reflections off the surfaces of glass buildings onto surrounding terrain are made visible.