Jathilan is a traditional Javanese dance ritual that takes roots in ancient pre-Islamic culture, but remains popular nowadays. Performers are believed to be possessed by spirits. In some sort of a trance condition they may act like animals, eat dirt or even glass. Finally the pawang (shaman) and his assistants have to take care of the performers to make spirits peacefully leave their bodies.
Illustrated article on Jathilan published in Discovery Magazine Russia #2 2015.