This is a classic design of a metate and mano for grinding grain and corn. As you can imagine, it took a long time to get enough ground to feed a family. In addition, the grit from the basalt stones would get in the food and wear away the teeth of those who ate the meal. I am glad we have an electric wheat mill that will make wonderful flour in just a few seconds of grinding. I also like the idea of buying bread already made from a store.