Image from springwise.com

Just when we think we’ve seen every possible QR Code implementation, something new comes around.

This time it’s from Seoul where springwise.com reports on a retailer used QR Codes constructed out of physical blocks. These “3D” QR Codes can only be scanned when the sun is at a certain angle – during a certain part of the day. A part of the day that just happens to coincide with the retailers slack time.

Regina Gauer, who spotted the 3D implementation, reported, “Dubbed “Sunny Sale,” Emart’s effort involved setting up a series of what it calls “shadow” QR codes that depend on peak sunlight for proper viewing and were scannable only between 12 and 1 pm each day. ”