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also be used to make an object, or person--reflected in, say, a mirror--appear to morph into another (or vice versa). This is the principle behind the Girl-to-Gorilla trick found in old carnival sideshows. Another variation: the hidden room may itself be painted black, with only light-coloured objects in it. In this case, when light is cast on the room, only the light objects strongly reflect that light, and therefore appear as ghostly, translucent images on the (invisible) pane

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