In the Yuan Dynasty, Chen wrote in four volumes of "Essentials of Elixir": "Yes, it is nothing more than three things, and it is based on the feeling of three things. Shun is an adult, and reverse is an elixir. What is Shun? A person's life is two, two gives birth to three and three gives birth to everything, so it is illusory, deified, refined and in the shape of an adult. What is inverse? Everything contains three, three returns to two, and two returns to one. Those who know this way are happy to keep shape, cultivate shape and refine essence, accumulate refined qi, refine qi and connect spirit, and refine spirit is still empty, then the elixir will succeed.
Second, the introduction of Gankun Circle:
Gankun circle, also known as Yin-Yang circle, is a Taoist instrument and one of the important religious practices of Taoism. It is two rings connected together, which can be rotated back and forth in the hand, representing the meaning of "yin and yang cycle, cycle after cycle". Usually made of wood or jade. There is also the Three Rings, which are called "Three Talented Rings" or "Three Rings for the Moon". Old Taoist priests especially like to play with this, thinking that activities refer to wrists.
Third, the chart: