"I'm not sure when the mural above first appeared in Vancouver, British Columbia. But I recently noticed a QR code painted over an offending tag that had been sprayed on the mural. Remarkably, the QR Code takes you to an image of the mural before it was vandalized."
*see also Sweza, FinalFrontier, Michele Pred, Bernhard Hopfengärtner
"The UX (Urban eXperiment) is an largely secret underground organization that improves hidden corners of Paris. Their works have included restoring the Pantheon clock, building a cinema, complete with bar and restaurant, underneath the Trocadéro, restoring medieval crypts, and staging plays and readings in monuments after dark."