Y'dig?

Attached is a draft drawing Shri Mataji did may be in 1977 in London. I do not recall Her words exactly, but it was about this:  The form of the human brain is a prismatic form. The “Divine Rays” (my words) enter the subtle system through the brain as the foetus is about 3 months old. They divide into 3 main rays, because of the conical shape. The Kundalini is the ray of energy that enters directly into the sushumna nadi, the spinal cord, without any reflexion. The Kundalini goes straight to the sacrum bone and stays in a dormant state.

Above right H.H. drafted this flat, rounded thing, the animal brain, which disseminates, scatters the rays out to the sides.
Udo