What is a scrim?

A scrim is a see through curtain that allows light, people or objects that are behind the curtain to pass through. It adds a magical feeling on stage when a light is bouncing off of a person in which the shadow appears to be dancing or moving. A scrim is also useful when adding a fashion technique to a performance by using motion lights bouncing while a character is dancing behind the scrim. You may also see scrims on stage just to add a certain type of mood to the performance. If you've ever seen a curtain with a blue or selected color bouncing off of it than most likely it was a scrim.