Eli5: Why do all my cups and glasses have rims on the bottom that collect water in the dishwasher?
In: Other
Not an expert in any of those topics regarding cups, but Id speculate that for the case of pottery, its a product of the manufacturing process. In the production of pottery, a piece of clay is moulded wet, and then dried to set its shape. Due to the existence of gravity, the pottery will have to stand on something and dry that way. Then after drying, they fire the clay to make it water resistant. They will eventually have to scrape or get the dried clay off the thing it was sitting on while drying. If the bottom is flat, this would be problematic but if the surface in contact is a thin ring as opposed to a filled-in circle its easier to be released from the racks.
Plus, if its the same amount of material used, a dome is structurally stronger than a flat slab of material or feature of a design.
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