How to make a Pepper's ghost

Alex Eylar is a master of the small, well-constructed and well-lit scene. Here he shares how to construct a Pepper's Ghost. Don't know what that is? Me neither, but Alex explains it well: Pepper's Ghost is a theatrical effect used in turn-of-the-century stage productions (as well as Disneyland's Haunted Mansion) in which the image of an actor is reflected onto a tilted sheet of glass in front of the stage, making it appear as if a ghost were walking on the stage.