What is the concept of outer ring geomantic omen? Do you mean heaven and earth? 50 points

The square is yin, the circle is yang, and the square is the ground. The circle is the sky, which means the place where the sky is round, just like whether it is Thai or not. If it is the worst of the sixty-four hexagrams, it will become the Thai hexagrams, and the Thai hexagrams will be the best of the sixty-four hexagrams. The outer circle is to put the sky in the middle of the sun, close the sky, enclose the ground, and integrate heaven and earth, adding people into heaven and earth. That is Thailand.