Just after the events a new billboard was set on the old wall. 39 years later it was torn down for a new "high tech" one, revealing this archeological surprise :-) . The tag stayed for about a month before being erased, the wall grouted anew, then the new billboard was set up !

I'm sure there are others waiting to see the light again :-)

"What can I do, What can I write, Against the fall of Night". A.E. Housman