During the most popular version of this ceremony, an open door facing east is the only entrance to the "hocoka", a temporary arbor built around a cottonwood tree. Some participants in this ceremony plunge hooks into the skin 
During the most popular version of this ceremony, an open door facing east is the only entrance to the "hocoka", a temporary arbor built around a cottonwood tree. Some participants in this ceremony plunge hooks into the skin on their chests, which are attached to poles set in the ground by bison sinews. A series of rafters are set around a sacred pole within a medicine lodge in the Blackfoot version of this ritual, which was suppressed in the United States and Canada until the mid-20th century. For 10 points, the Sioux and other Plains Indians practice what ritual in which the power of a heavenly body is invoked?
During the most popular version of this ceremony, an open door facing east is the only entrance to the "hocoka", a temporary arbor built around a cottonwood tree.