A 538 square feet QR Code now hangs on the facade of the 18th century Chateau de l’Hermine in Vannes, France (image below). Regular 2d-code readers may recall a year ago that the city of Vannes hosted an international exhibition of QR Code art. Now city officials are using the giant QR Code to promote their mobile site for the benefit of the many tourists that visit this historic town. Not only is the mobile site very informative but it also includes a scratch game and a game of tic-tac-toe for which there are numerous prizes. Implementation is by the same team that invented QR Code cows. Edit: I didn’t get that quite right. The idea originated with them but the implementation was by mobiLead, as Laurent points out in his comment below.