Peppers Ghost

 

Pepper's ghost is an illusion technique, used in theatre, cinema, amusement parks, museums, television, and concerts, in which an image of an object offstage is projected so that it appears to be in front of the audience. The technique is named after the English scientist John Henry Pepper, who popularised the effect during an 1862 Christmas Eve theatrical production of the Charles Dickens novella The Haunted Man and the Ghost's Bargain, which caused a sensation among those in attendance at the Regent Street theatre in London