Translucent   glass façades require daylight modulation, thermal performance, safety and   architectural quality, yet these functions rely on multi-material assemblies   that constrain end-of-life separation. Complex glass waste remains   underutilised, downcycled or discarded. Illuminating Marble addresses these   challenges through a heat-bonded, multi-performance all-glass composite   comprising marble-like skins, a porous foamed-glass core for insulation and   lightweighting, and engineered interfaces for post-fracture safety. Its   novelty lies in integrating safety-by-design and safety-by-material-engineering   within a mono-material system. Kiln-based prototyping showed that   photovoltaic and fluorescent-lamp glass formed functional layers, while sugar-beet   factory lime proved an effective waste-derived foaming agent. Fragment size,   casting orientation and contamination controlled colour and translucency.   Foams showed promising thermal conductivity despite variable glass purity.   Comparative impact testing indicated how each strategy contributed to   post-fracture redundancy. A user perception study showed increased acceptance   following waste-origin disclosure, while product evaluation demonstrated   tunable form and thermal response. Re-firing provided proof of principle for   circular all-glass façades.