"Sorry, offer not available in Seattle." ;) | Hacker News

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		maybird on May 25, 2012 \| parent \| context \| favorite \| on: Retailer uses 3D QR codes and the Sun to time limi... "Sorry, offer not available in Seattle." ;)

ecocentrik on May 25, 2012 [–]

It would require hard shadows... since clouds defuse light resulting in soft shadows it wouldn't work if there are any clouds covering the sun.

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