These rocks contain a high percentage of iron and their dark appearance forms a truly ancient landscape. The rocks make a ‘metal sound’ when played; they are referred to with different names like ‘rock gongs’, ‘ringing rocks’ or ‘bushman pianos’. Found in various areas around the world and accross Africa, tradition formed around communicating with the help of the rocks - evident by the ancient drumming marks often found on them. The rocks and the sounds they make were seen to have magical powers.