Minoan art has a variety of subject-matter, much of it appearing across different media, although only some styles of pottery include figurative scenes. Bull-leaping appears in painting and several types of sculpture, and is thought to have had a religious significance; bull's heads are also a popular subject in terracotta and other sculptural materials. There are no figures that appear to be portraits of individuals, or are clearly royal, and the identities of religious figures is often tentative, with scholars uncertain whether they are deities, clergy or devotees. Equally, whether painted rooms were "shrines" or secular is far from clear; one room in Akrotiri has been argued to be a bedroom, with remains of a bed, or a shrine.