China's traditional culture is extensive and profound, and the theory of Yin and Yang is its core and essence. The theory of Yin and Yang, with a simple dialectical color, is the way of thinking of China sages in understanding the world. Thousands of years of social practice have proved its correctness. "The sky is round and the earth is round" is the concrete embodiment of this theory.
The ancients called the state where heaven and earth were indistinguishable and chaos began to open, and Tai Chi gave birth to two devices, which separated yin and yang and heaven and earth. The ancients called the vast universe composed of many stars "heaven" and the field they lived in "earth", because the sun, the moon and other celestial bodies are moving endlessly, like a closed circle with no starting point and no ending point; But the earth is quietly taking us there, just like a square object is static and stable, so the concept of "a round place" has emerged.
Throughout nature, all round objects are active and unstable, just like the round sun and moon; All square objects are static and stable, just like the quiet earth. Movement is Yang, and quietness is Yin, so "Tianyuan" has become a symbol of Yang, representing all active things, such as sun, sky, rigidity, health, public, gentleman, husband, greatness, abundance, upward, progressive, dynamic and upright. "Chu" has become a symbol of yin, representing all passive things such as the moon, the night, softness, obedience, women, ministers, wives, children, retreat, quietness and negativity.