Ceramics is the art and science of making objects from inorganic, non-metallic materials by the action of heat. In art history, ceramics and ceramic art mean tableware, art objects and tiles made from clay and other ceramic materials by the process of pottery, so excluding glass and also mosaic, normally made from glass tesserae. Some ceramic products are regarded as fine art, while others are regarded as decorative, industrial or applied art objects, or as artifacts in archaeology. The identification of a ceramic object as art varies, and there is no agreed standard or definition. It may be made by one individual or in a factory where a group of people design, make and decorate the ware. Modern decorative ceramics are sometimes called “art pottery.”