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(a) Two pictorial objects of different size. When superimposed over the picture, object 1 looks less distant than object 2. (b) Again, two pictorial objects of different size, object 1 looking less distant than object 2. In this case picture (b) is a scaled version of picture (a). (c) Three pictorial objects, 1 the largest, 3 the smallest. Object 1 looks closer than object 2, which again looks closer than object 3.
