My wife and I recently watched the very cool documentary "Exit through the gift shop" directed by the famous street artist Banksy. Featured in the movie is the street artist who calls himself "Space Invader". The other day my wife was walking downtown and she came across what appears to be one of his pieces (Picture Above). This doesn't have much to do with Germany but the movie was great and I think his work is pretty cool. That is reason enough for me.
Check the movie out if you get a chance.