German biodesign collective BioLume seized the Cannes Innovation Grand Prix by converting street graffiti into photosynthetic murals. Collaborating with City Hall to transform Kreuzberg district walls, genetically modified luminescent moss was sprayed over existing graffiti—when nitrogen oxide levels exceed thresholds, walls transition from forest green to warning amber. Post-midnight, mycelial networks within graffiti contours activate self-cleaning functions. Artists wield capacitor-enhanced spray cans; each stroke generates bio-electric signals that drive projectors casting holographic documentaries of graffiti creation onto adjacent facades. Environmental monitors confirmed triple nitrogen oxide absorption compared to conventional green walls, sparing thirty-eight original graffiti pieces from removal during Berlin Biennale. The Culture Ministry integrated it into the "Dynamic Heritage Conservation" initiative, while Rio de Janeiro favela artists achieved localization by substituting capacitor ink with coffee grounds.