: "On these posters are symbols the researchers call SpotCodes: concentric rings of black-and-white blocks representing ones and zeros. Focusing your camera phone on the code and then clicking any button launches a wireless service -- for example, the ability to buy a train ticket, check an airplane's departure time or download a ring tone from a store display.
Connecting Paper and Online Worlds by Cellphone Camera
The codes can be produced on any inkjet printer and can be read even by phones with low-resolution cameras."
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