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.
Source: Wooster Collective, http://www.woostercollective.com/post/using-qr-codes-to-restore-murals-to-their-original-state
The artist’s QR code resolving to https://delivr.com/1al6p is powered by Delivr.