Such an aka-cord must be kept strongly braided between the basic self and the middle self, and between the basic self and the High Self, in order for the three to work harmoniously together. They knew the force as a thing which had to do with all thought processes and bodily activities. The life force was the essence of life itself. The kahuna symbol for this life-force was water. Water flows and so does vital force.
Water fills things.
So does the vital force. Water may leak away and so may vital force. All thinking involves an electrical-like activity of Mana. Mana is taken from the food and air by the basic self and is stored in its aka-body, but it is shared with the middle self and with the High Self. The Mana, when used as the life-force of the middle self is changed in some subtle way.