The right-hand border of the Nei Jing Tu represents the spinal column and skull. The scenes depicted at different levels along the spine are alchemical changes occurring within the fields of the dantians or chakras.
The space in front of the tailbone and sacrum is known, in Taoist yoga, as the Golden Urn. In Hindu yoga traditions, it's known as the home of Kundalini Shakti -- an energy which, when dormant, lies coiled like a snake at the base of the spine. When awakened, it initiates the energetic transformations depicted in the Nei Jing Tu.
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