Pottery is made by combining naturally occurring raw materials, such as clay, earthen minerals, and water and shaping them into forms. Once shaped, the clay body is fired in a kiln at a high temperature to be hardened and heat resistant. There are a number of pottery techniques used to create functional and ornamental ceramic objects. Potters use wheel throwing to create symmetrical pottery and slip casting to create multiples of one object. They may also use hand-building techniques such as slab rolling, coiling, and pinching