To answer to that question we need to understand the energetics of the Colon. When we look at the Co M+ (Geng) and the trigram of Thunder we know that it means the ability to go inside, to look inside with the clarity of Yang. After Sp E-, where the creation process is complete, we have a centre, we are somebody, then in Co M+ we start to explore the inner life, our inside with the help of the Yang line on the bottom of Thunder trigram. When we look on the earthly arrangement of trigrams (Fu Xi), we start with the Yang root from Qian then Dui, Li and Zhen. From the trigram Zhen there is a pivot, a change from Yang root to the Yin root, from the trigram Zhen to Xun. The lower line is changing from Yang to Yin. It means that there needs to be some kind of unity, the meeting between Yang and Yin, where we are outside of the duality of life, where we are pure and connected with the unity of life.
It is mirrored in the topography of the Colon meridian as a crossing sides of the body on the face between Co 19 and Co 20. First we need to be able to look inside and purify our essence through the points Co1 to Co 11 then we purify our consciousness and awareness (Co12-14), connecting with the Heart at the point Co 15. After we are rooted in Earth (Co16) and connected to Heaven (Co18) we can receive nourishment at the level of Man(Co19). From there, Co meridian is crossing sides of the body through the Centre of Humanity (Du 26) to the point called Welcoming Fragrance (Co 20). It means that we are now somebody, we have our life experiences, we are aware of who we are as a human being and we can illuminate, brighten our Shen. We move from the inside to the outside. We are able to welcome life, to experience life as it is. Our nose and our eyes are open through the connection of Co20-Bl1-St1.
This ability to move from the inside to the outside is reflected in the hexagram of the Colon branch. When we look at the hexagrams, the lower trigram shows the inside, the subject and the upper trigram means what’s outside, the object. In the hexagram of Colon branch we have lower trigram of Qian and the upper of Zhen. Comparing it to the previous hexagram of Lu branch (lower Qian, upper Kun) we see here that the fourth Yang line in Co branch is now in the object world, is outside. We are ready to be open to new experiences (St branch). We are ready to be open to life.
To summarise we can say that Co meridian unites Yin and Yang and brings purity for the brightness of the Heart and the Shen.
