For what ride is Pepper's ghost, an illusion technique, used when the Blue Fairy disappears, leaving a pile of fiber-optic fairy dust on the floor?
Pepper's ghost: Pepper's ghost is an illusion technique used in theatre, amusement parks, museums, television, and concerts. Pinocchio's Daring Journey:  The Pepper's Ghost illusion (used extensively in the Haunted Mansion) is used when the Blue Fairy disappears, leaving a pile of fiber-optic fairy dust on the floor.
i don't know