This black plastic or bakelite disc is glued to the package shelf right in the center. A couple people on here have mentioned that people would keep a roll of TP back there decorated with a crocheted cover. But I'll be darned if I can figure how this disc would facilitate that. It is about the size of a roll of TP, but wouldn't hold it or anything. Does anybody have any ideas what purpose this might have? Otherwise I am sticking with the TP roll thing, even though I don't quite get it.