The appearance during the first millennium A.D. of small, exquisitely carved artifacts of walrus ivory in the Bering Strait region marks the beginning of an extraordinary florescence in the art and culture of North America. The discovery in the 1930s and 1940s of world-class carvings of animals, mythical beasts, shape-shifting creatures, masks, and human figurines astounded scholars and excited collectors. Nevertheless, the extraordinary objects...