1. A method for making a real image of an object appear and disappear, comprising: providing a real image projector for projecting a real image of an object; providing a first polarizer including a first transmissive axis for polarizing light; providing a second polarizer including a second transmissive axis for polarizing light; and changing the angular relationship between the first transmissive axis and the second transmissive axis relative to each other for making a real image appear and disappear, wherein the real image of the object essentially maintains its true color while transitioning from the appearance of the real image of the object to disappearance of the real image of the object.