Ronald Naversen teaches at Southern Illinois University in the United States.He loves masks and collects them from countries all over the world.He has about 150 masks in his collection,but Ronald doesn't just collect masks.He makes and studies them as well.He travels the world to learn about masks.One of Ronald's favorite places to see masks is Bali,in Indonesia.Bali is famous for its beautiful masks.The masks are very special,and can take four months to make.Dancers wear with amazing costumes.They dance in temples.When They wear their masks,the dancers look differet,and they feel different,too. People in Bali think masks have special powers.