"Ruo"consists of three movements:"fork hand""raise left right shoulder"and"move foot to clap"with the meaning of accompaniment and response.From the perspective of dance appearance,the meanings of"rai-sing the left and right shoulder"and"moving the foot to clap"are clear,but there is no consensus on"crossing hands".Due to its secular and sacred transmission contexts,it constitutes the phenomenon of"same name but differ-ent dances".The emergence of this phenomenon is not accidental,but determined by the rules of dance and ritual.Behind this rule,it reflects its unique cosmology of musicality.