We have begun to see QR tags (a type of bar code) everywhere. I see them in a couple of the magazines that I read all the time. You can scan a tag with a smart phone and you receive access to additional information. This additional information might be text, or pictures, or anything you can upload to the web.
The link below will take you to a story about a creative way QR tags are being used to sell real estate. How can they be used to tell the story of an exhibition or a single piece of art?
http://fields.eca.ac.uk/totem/?p=503
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