A Zip Line in the Hall?

Can you believe this picture? The caption under it is, "A zip line in the hall?" I ran upon it as I was looking for a picture for the last post. I mean I don't remember any thing like this at all. Can you figure what the zip line is hooked to? No wonder those lights in the hall always seemed to be crooked. And who fixed that all up for Josh?
Probably none of you remember it. Well, at least there was some fun to be had around the place, and the house pretty well survived. In fact there were probably more opportunities for the continual apprenticeship repairs and remodeling that were needed. So it all works for good.