Artist Scott Blake is known for making art from QR codes and bar codes. Each code can be individually scanned and linked to the person who is being portrayed. E.g. the Elvis Presley image is connected to a large number of CDs and music by the singer.
Notes by Blake (published at the Barcode Art website):
I have made more than 30 large-scale digital portraits of cultural icons using actual barcodes connected to some aspect of their lives. My Barcode Elvis portrait is made with barcodes from his music CDs. Barcode Bruce Lee and Barcode Marilyn Monroe are comprised of barcodes from their movie DVDs. Barcode Oprah is made with the ISBN barcodes from her book club. Interact with my art. Move beyond form to function. Scan the barcodes with your smartphone.
Photo and artwork © Scott Blake Link via CMYBacon