I had been to this location several times, and a friend recently told me there was stuff hanging from the ceiling so we headed back. There were different color lengths of plastic? string / wire hanging all around the open area in the back.
Red cord tied to pole.
Red cord tied to old? paint can.
Long bundle of white cords. Another weird thing was this wall was covered by sheets of plain paper. We didn't mess with them, but they stuck through the wind blowing.
Blue string up top
Black strings hanging down
Black strings duct taped to wall. Someone brought supplies and took time to set this up.
Blue string held taught at bottom