The illusion is conveyed succinctly in the illustration top right. A large glass screen, set at an angle, catches a reflection from a brightly lit actor in an area hidden from the audience. Not noticing the glass screen, the audience mistakenly perceive this reflection as a ghostly figure located among the actors on the main stage. The lighting of the actor in the hidden area can be gradually brightened or dimmed to make the ghost image fade in and out of visibility.