Blue, What do you think of the term "nation" or "company"? Are these terms useless and not worth saying? After all, we know that a nation is a collection of people with a certain sort of relationship to each other, so why have the term or the concept? To continue this analogy, you would be saying, "Where is this nation you speak of? What proof do you have that there are nations?" When I reply that this is simply the name for a set of relationships, not an "entity" that exists out there that can be proven to exist, you would be responding, "If it's just relationships between individuals pitching in money to build things and defending one another and passing laws, then why even make up a term?" I hope this analogy helps to illustrate how identifying concepts of relationships of parts can be useful. This is why I think, when we think of the relationship of our decision-making faculties to the matter around us (both in our ability to affect it and detect it), that it may be useful to focus on this concept in some contexts, and that having a name for it would then also be useful (i.e. the metaphysical body).