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May 23, 2012 01:10 pm PDT
Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/IHj2DgmMM24/shadow-qr-codes-that-only-work.html
Shadow QR codes that only work in certain sunlight
Generally I think QR codes are a lame stopgap technology. But this application by the Korean retailer Emart is fairly clever. They deployed 3D "Shadow QR codes" that only work during certain sunlight hours, lunchtime specifically. I could imagine this kinda thing being a fun clue in an alternate reality game. "In Seoul, retailer uses [...]Original Link: http://feeds.boingboing.net/~r/boingboing/iBag/~3/IHj2DgmMM24/shadow-qr-codes-that-only-work.html
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