The human face of this mask is rendered with particular realism. The articulated lips are manipulated by cords, allowing the bone teeth to be revealed. This object was used by the shaman to represent the spirit of a man. His performance with it was theatrical and included acting, music, and the incorporation of a number of stage props. Such masks moved mysteriously, and the shaman wearing it could disappear or reappear at will during the play, with the help of trap doors and magic chests like those used by European musicians. His skill and the crash of the musical accompaniment created an otherworldly and magical atmosphere.