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“QR codes have been exhibiting an uncharacteristic characteristic lately—they’ve been not sucking as much. We had the Korean retailer’s 3-D sunlight-activated QR code, which was scannable only at lunch, when the shadows lined up. Now, we have this Guinness QR code on a beer glass, dreamed up by BBDO New York.”

http://www.adweek.com/adfreak/guinness-qr-cup-reveals-scannable-code-when-full-140602

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