There was a short film showing on a loop near Checkpoint Charlie in the days leading up to the balloon release. I find looking back at the times when Berlin was divided so interesting - the city has changed so much! Some parts of it are even unrecognizable from before. This was a sign the West Berliners put up to remind the young men in the watchtowers in East Berlin to think instead of shooting. Good advice, I think, but probably not heeded. For more signs, take a look at Signs, Signs.