1, 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 the worst of the 64 hexagrams. If it is bad enough, it will become a Thai hexagram, which is the best of the 64 hexagrams.
2, the inner circle of foreign countries, is to put the sky in the middle of the generation, the sky is harvested, the land is surrounded, the world is one, and the people are the people of heaven and earth, that is, Thailand.