“…At least apparent size, shape, orientation in space, and possibly brightness (1,3,18,22,34,36) can be shown to be dependent on apparent distance. Apparent distance, however, is in turn dependent on size, shape, orientation in space, and brightness (1,3,17,18,23,25), so that analogous statements can be made reversing the direction of the effect. If the apparent size, shape, orientation, and brightness of an object deviate from the objective size, shape, etc., then both the apparent absolute distance of the object and the apparent relative distances of various parts of the object will deviate from the corresponding objective distances (1,2,20,23,25).…”