A giant QR code is seen near a housing construction site, owned by Chinese developer Vanke in Hefei in central China's Anhui province, on May 17, 2013. The 6,400-square-meter QR code, made with marbles and lawn, can be scanned from the air by mobile phone and takes visitors to a website that's intended to attract home buyers to the housing project, according to local media. (Photo by Associated Press)
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