In the ballet dance performances and so on, in order to balance the actors, often in the back of the auditorium equipped with a red light positioning, the light on them, like a locator.

• 在芭蕾舞等舞蹈演出中，演员们为了平衡，往往会在观众席的后面装上一盏红色的定位灯，这盏灯对他们而言就像一个定位仪。