The QR code that only comes out at Midday...

Emart, one of Korea's largest retailers, needed to increase sales during the lunch time period. 

Their solution, a QR code, which when scanned gives the customer a generous 25% off. However, the catch is that the QR code is made from shadows created by the sunlight, and the shadows are only in the correct place at midday. Therefore the QR code can only be scanned between the noon and 1pm. 

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