For months, the French developer - Ubisoft Montreuil - and its neighboring office building - BNP bank - have been going back and forth creating 8-bit window art with Post-It notes as a bit of a challenge It started in France, but now other companies around the world are following this trend. At some point, someone will start asking questions about what you really do during their working hours. In the meantime, keep up the great work. Check out the pictures from their Post-it battle below.