The Cloud Gong ( 雲璈 Yun Ao ) is a kind of musical instrument. The History of the Yuan says: « The Cloud Gong is a small gong made of brass with a framework and a handle. It is held in the left hand and beaten on the rhythm of recitation with an ivory ball on the top of a small bamboo stick in the right hand ». The Daoist Book of Following the Spirits ( 《道書援神契》Daoshu Yuanshen Qi ) says, "The ancients had music in rites and this is an imitation of that. The Cloud Gong held in the hand symbolizes heavenly music and can be played in procession. So Daoists have adopted it.