This goes back to basic evolution. Accept it or don't. Human bipedalism began in the days of ardipithicus, and refined itself through the last 4 million years.<quoted text>
All animals are metaphors for ALL aspects of our psyche. We are not just one type of animal.
Can you tell us how bipedalism actually occured? How do you know we didn't get that from kangaroos?
I only suggest the animal reference because I think that animal algorithms do exist as overlays to a core human psyche. I've already posted on the subject. I don't think you'll find such things among the traditional Caucasian populations because they are psychological extroverts who aren't very stable when contending with mixed feelings. It would take some time to explain.
I simply don't consider "spirits" to exist, and the psyche just is not separate from anatomy. People don't like things to be reduced to algorithms and a set of experiences, but that is the nature of things anyway.