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Business. Pepper's ghost. Technique[edit] In order for the illusion to work, the viewer must be able to see into the main room, but not into the hidden or "Blue Room.
" The edge of the glass is sometimes hidden by a cleverly designed pattern in the floor. The hidden room may instead be painted black, with only light-colored objects in it. In this case when light is cast on the room, only the light objects reflect the light and appear as ghostly translucent images superimposed in the visible room. In the Haunted Mansion at Disneyland/Walt Disney World and Disneyland Tokyo, the glass is vertical to the viewer as opposed to the normal angled position, reflecting animated props below and above the viewer that create the appearance of three-dimensional, translucent "ghosts" which appear to be dancing through the ballroom and interacting with props in the physical ballroom. Epson.