The Bwa and Nuna created masks that show the spirits and put them in touch with the people. The masks are made by people who live in the southern parts of their territory. Bwa masks are thought to possess unusual powers which are controlled by those who wear them. They symbolize the celebration of a boys' adulthood, and represent information about myths and morality that the boys must learn before they can be thought of as an adult. Bwa masks are usually made out of wood, but they can be made from different things like wood, bronze, brass, copper, ivory, and terra cotta. Then they are often decorated with colored beads, bone, animal skins and vegetable fiber, and occasionally they have sacrificial blood put on them to increase their spiritual power. The Bwa mask is typically made out of wood for two reasons: trees are all around in the forests, and the maker believes that the tree has a spiritual soul and its wood is the best home for the spirit in the mask. The Adze is traditionally used to make this special mask, and is also thought to have its own spirits. According to legends, when tools, like the Adze, are passed down through generations, they sometimes inherit the spirits of the owners before them. Bwa masks are board shaped with a round face at the bottom and a curved moon at the top. The person wearing it looks through a hole in the mouth. The eyes look like an owl, and the nose looks like the hornbill bird. Both these birds are thought to possess magical powers. The board part is decorated with intricate patterns which are an essential design part in many African masks and carvings. The patterns make a rhythm which shows the internal spiritual energy of the artwork. It can also be used as a coded language where the design communicates secret knowledge to those who know.