I’m very doubtful of the significance of this because it seems unlikely that evolution would have selected for this kind of perception (there are many points of failure, not just a single one). It seems more likely that this notion only arises when you ask this very question, and that naturally, the mind is simply concerned with the position of all body parts (for safety and coordination, a.k.a. proprioception). With drugs or some dedication we appear to be able to override parts of our self-representation which are concerned with proprioception with arbitrary stories that incorporate sensations that we focus on, but it should better be something romantic (“the brain with which I think, the feet with which I feel the ground”), as people would laugh at your if you said your self is located at your anus because you defacate from it.
I’m very doubtful of the significance of this because it seems unlikely that evolution would have selected for this kind of perception (there are many points of failure, not just a single one). It seems more likely that this notion only arises when you ask this very question, and that naturally, the mind is simply concerned with the position of all body parts (for safety and coordination, a.k.a. proprioception). With drugs or some dedication we appear to be able to override parts of our self-representation which are concerned with proprioception with arbitrary stories that incorporate sensations that we focus on, but it should better be something romantic (“the brain with which I think, the feet with which I feel the ground”), as people would laugh at your if you said your self is located at your anus because you defacate from it.