Among the most spectacular manifestations of Aboriginal culture are the ceremonies and dances. There is now also contemporary dancing, performed by urban Aboriginal groups all over Australia; these dances however take their clues from traditional dances from various places and are performed to audiences all over the world. Traditional dances are also often performed in the communities just for fun and, for instance, to celebrate the opening of a new building or even the graduation from college. All dances have their roots in the "dreamings", the creation myths, sung in the old languages while the actions of the performers illustrate the deeds of the "Dreamtime Heroes", the mythical beings that created the land in the mythical past. Hard wooden clapsticks are used to keep time and the "didjeridu", the famous dronepipe made from a hollow log, provides a unique background sound. Among the peoples of central Australia a social corroborree is known as "purlapa" and usually takes the form of a stamping dance by men and boys, decorated with "wamurlu", a vegetable down (kind of wild cotton), left in its natural light grey or coloured with red ochre. This "wamurlu" is stuck to the body and the designs always reflect the "dreaming" that is sung and is unique to the kinship affiliation of the dancer. Women have their own dances, often a loose-knee shuffle, while holding painted boards or sticks. Elaborate designs are painted on their upper bodies.