That’s a fascinating concept. I’d start by looking at photochromic dyes that shift color with light, then embed microcapsules that release different scent molecules as the dye changes. The key is to sync the release kinetics so the aroma updates in real time, not lagging behind the color. I’d run a series of tests to balance intensity and avoid overwhelming the senses, and I’d probably layer the formulation to keep the chemistry stable. It’s ambitious, but with careful tuning it could turn a wall into a living, evolving artwork.