A method used by sculptors, it allows them to make copies of their work by using materials such as clay, metal or plastic; placing the material in a mold; and allowing it to harden so that it takes on the shape of the confining mold. Sources: Kimberley Reynolds & Richard Seddon, "Illustrated Dictionary of Art Terms"; <br><br>1. The process of making a mould (plaster, or rubber, polymer and plaster, etc.) from an original. Also, loosely, the activities that take place in the foundry. See Cast.