What is the function of 1) potlatch dishes, such as Stan Wamiss' Halibut Feast Dish (fig. 5.20); 2) potlatch hats (Lecture 11); and 3) totem/crest poles, such as Arthur Shaughnessy's Interior House Post (fig. 12.15)? Compare and contrast what the three artforms have in common and what makes them different?