A Mobius *****...even though you'd think otherwise it also has only one side and one edge.
You first cut a ribbon of, say, paper, and instead of joining the ends normally, give it one twist, then tape it together. A regular non-twisted "ring" can have inside one color and outside another, but if you color a Mobius ***** you'll color it's ONLY side by going around it. A "middle" would require two sides.
I dont know and I dont care.
I second lexxie