My nephews used to do it when my brother had his farm. One of the first years they were there my bro was about halfway through the bales in the loft when he came across a room the boys had made outta the bales. He told me he just stood there stunned...staring at an old football helmet sitting on a bale in the middle of the "room". Looking at the half burnt candle sitting on top of the helmet the boys had been using for light in the room.
Hides were tanned that day, hides were tanned.