I did some more reading on the Homosexual Monument, and it's similarity to Holocaust Memorial across the street is no coincidence. Elmgreen and Dragset wanted it to reflect the universal human sameness of all victims of the Nazis while still acknowledging individual uniqueness. At the same time, they also wanted a dynamic monument that would have a life of its own. When one looks in the window, he sees a homosexual pair kissing "endlessly". The video changes out occasionally, and the couple could be either male or female.
It's not a surprise that the memorial has been vandalized, either. However, when I visited it, there were still wreaths at its base, left there during Christopher Street Days--a huge gay pride party in Berlin that took place while I was still in the Rhineland.
