From: The World In Your Head by Steven Lehar

Fig. 9.1 (A) Amodal completion of an object through occlusion. (B) A more ambiguous case of amodal completion in which the completion path is uncertain. (C) A still more uncertain amodal completion, and yet a spatial percept nonetheless. Notice how the amodal image of the cat changes if you consider the feature on the right not as the catís tail, but as some other extraneous object, which makes the amodal percept of the cat pull away from it, like an elastic blob after removal of an anchor point.