Radiographic images are only two-dimensional, and often it is difficult to discriminate the relative location of overlapping objects. A, When the source of the radiation is directly perpendicular to overlapping objects, the image is captured without much separation of the objects. However, when the radiation source is at an angle to offset the overlapping objects, the image is captured with the objects being viewed as separated. B, The object that is closest to the film (or sensor) will move the least, with the object closest to the radiation source appearing farthest away.