See Energy-bodies added when the body is owned by an Ultimate-self.
Lower-self can be seen somewhat as an other-pole to Higher-self, but the two are not two poles of one system, they are separate systems.
Lower-self has an upper-pole at the feet level, which produces a golden glow somewhat large than the body, if in good condition.
The lower-pole is about 900 meters below the feet.
This system facilitates functionality and influence by connecting as needed to Spirits outside oneself.