This is very clever. Of course, they will need to move the signs slightly every ...

		joejohnson on May 25, 2012 \| parent \| context \| favorite \| on: Retailer uses 3D QR codes and the Sun to time limi... This is very clever. Of course, they will need to move the signs slightly every day, as the alignment of the 12-1 o'clock hour will change with the seasons. Also, what's preventing someone from taking a picture at the proper time and posting that photo on the internet?

The article, in fact, does this. So nothing. It's just an ad.