French butter dish for storing butter at room temperature. You put water in the larger bowl, butter in the smaller one, and put the small bowl into the larger one for storage. Check out http://en.wikipedia.org/wiki/French_butter_dish for more info. This is the first time I've tried printing in ceramic from Shapeways and unfortunately, glazing is pretty inconsistent. But if you want one in ceramic anyway, you can get one at https://www.shapeways.com/model/1959688/french-butter-dish.html)