The meanings of the designs on totem poles are as varied as the cultures that make them. Totem poles may recount familiar legends, clan lineages, or notable events. Some poles celebrate cultural beliefs, but others are mostly artistic presentations. Certain types of totem poles are part of mortuary structures, and incorporate grave boxes with carved supporting poles, or recessed backs for grave boxes. Poles illustrate stories that commemorate historic persons, represent shamanic powers, or provide objects of public ridicule.