Bone carving is the act of creating art forms by carving into animal bones and often includes the carving of antlers and horns. It can result in the ornamentation of a bone, or the creation of a figure. It has been practiced by a variety of world cultures, sometimes as a cheaper, and recently a legal, substitute for ivory carving. It was important in prehistoric art, with notable figures like the Swimming Reindeer (antler), and many of the Venus figurines. The Anglo-Saxon Franks casket is a bone casket imitating earlier ivory ones. Bone was also used by artists and craftsmen to try out their designs, especially by metalworkers. Such pieces are known as “trial-pieces”.