I'm just wondering because I picked up a "mantic" sized mug today at the thrift store for a dollar today and I'm curious. Is there a difference in lather depending on bowl space? I've always used a smaller bowl for making lather and I've never really wondered until today if the bowl size makes a difference. I thought if there is a difference, maybe bigger ones distribute the soap and water ratio ratio, or smaller ones mix it faster. I don't know what do you guys think?