Historically, the performance consisted of shadows cast by an oil lamp onto a cotton screen. Today, the source of light used in "wayang" performance in Java is most often a halogen electric light, while Bali still uses the traditional firelight. Some modern forms of "wayang" such as "wayang sandosa" (from Bahasa Indonesia, since it uses the national language of Indonesian instead of Javanese) created in the Art Academy at Surakarta (STSI) employ theatrical spotlights, colored lights, contemporary music, and other innovations.