Thank you for taking into that tour around different artworks, it is almost like a exhibition of art but under open air. Berlin has a long history and it was quite hash too, nowadays it is free, colorful, open and this is the way how I like Berlin and Germany in general. Many of the art works are on the remnant of the wall and this is not in distant past when two parts of Germany and Berlin in particular were united.
By the way on one of the wall, the second last picture with a silhouette of man with our planet earth, next to it is writing that you have not mentioned and I just want people to know.
It says:
"Du hast gelernt was Freiheit heisst und das vergiss nicht mehr"
"You've learned what freedom means and that never forget"
Cheers, @Stef1
Yes I agree, it was an experience very different from the two first time that I came in Germany.
Thanks for the translation ! I understood it from my old vocabulary I leant at school, but I forgot to translate it ^^" So thank you @Stef1