double exposure

     A double exposure is two photographs made on the same piece of film. The photographs would be combined into one image--as if they were transparent and you could see both of them. You can probably see a double exposure on a photo-sharing site. A real double-exposure was made by taking two pictures, and developing them as one--but digital photo-editing software can produce a similar effect. Two people can be made to look like a third person who resembles both of them, for instance--as in the sites that will show you what your digital offspring would look like.