I would assume it will mostly be youths from the former GDR, which is extremely visible on economic maps, for instance: https://en.wikipedia.org/wiki/List_of_German_states_by_GRDP_...

Former East Germany is lit up in red, similar to how you could see the old borders on night satellite photos from the color temperature of the outdoor lights in West and East Germany, which was most easily noticed in Berlin (article has a picture from 2012): https://kottke.org/19/11/the-berlin-wall-of-light

The outdoor lights will eventually all be LED, which will erase the old border from the night skies.