Starting in 2012, Olf (Braunschweig) and Lupin (Hannover)  stuck hundreds of stickers, posters and tiles in Hannover. Most of this work has been destroyed. Murals came later, many of them are still well preserved. On the second pic you see Olf (on the right) + Lupin  (on the left) with the owner of the liitle store. I found this photo in the internet.  The last 3 murals have unfortunately been removed in the