Faustine Puras is using QR Codes to preserve streetart for posterity by photographing the graffiti before it is removed. After the graffiti has been cleaned off by the local authorities or building owner she places a QR Code in the exact location which resolves to an image of the original. If that is cleaned off and replaced with a new QR Code that resolves to an image of the old QR Code: the start of endless loop.