Sunny Sale 

We decided to give people a unique shopping experience that was only available at lunchtime. So, we created large three-dimensional QR codes that used sunlight and shadow so they could only be scanned between 12pm and 1pm. If a Shadow QR Code was scanned during the available times, people could enjoy special offers to purchase items via the Emart mobile app. The campaign was such a hit that it was expanded from 13 locations to 36. (www.cheil.com)