is a study of the tectonics of light in urban settings. The core of the project is a software workflow designed for the analysis of three-dimensional light in spatial envelopes--both urban/public and architectural/private. By quantifying and modeling the nuances of light and shadow across time we can make more informed design decisions aimed at more perceptual spaces with sustainable lighting conditions. Tokyo Luminary was a progression of the workflow, intended to serve as an outline for a consolidated future software, tested on various urban typologies in the city of Tokyo. One of the densest structural environments, Tokyo is a city that has been continuously striving to maintain light distribution in the face of rapid urbanization.