Raku (樂) is a process for firing pottery, developed in 16th century Japan. Raku was prized by the Japanese tea masters for its unique and timeless beauty. Pots are fired in a kiln. When the pots reach the desired temperature and the glazes have melted, the Raku pots are removed from the kiln. While still red hot, pots are placed in a pit of sawdust or other combustibles and covered so that the combustibles cannot burn freely. The chemical reaction between the combustibles and the molten glaze creates beautiful and unpredictable effects on the surface of the pottery. Metallic luster's and dark crackle effects are the hallmarks of Raku. Each piece, born of earth, water and fire is a unique creation, never to be duplicated.