  Further problems arise from the ambiguous status of holes in figure-ground displays (Bozzi 1975). Thus, for example, though it appears that the shapes of holes can be recognized by humans as accurately as the shapes of ordinary objects, the area seen through a hole typically belongs to the background of its host, and there is evidence to the effect that background regions are not represented as having shapes (Bertamini &amp; Croucher 2003; Bertamini &amp; Casati 2015). So what would the shape of a hole be, if any?