Because western culture can have a way of perceiveing reality and a Shaman another way. Thats a culture shock and and this comes close to the discussion of the objectivity of reality that VoidMatrix was mentioning. That is: the tension between different understandings of reality and the very idea of an objective reality itself. As always, an anthropology book fits well in this discussion as this is an important point for the discipline. I mentioned the last book I read that could contribute to the subject.

I think there was an overreaction/misunderstanding here.