The sun is called the hub because the sun does not rest on its own, like a wheel. The one with the sun's head is like Judah. Those who walk in the sky are moving in the sky, and those who are walking are moving. The one who falls is the left boundary, and the left is the bottom. Falling to the left boundary means that the gentleman is at the top of the bottom, and it means that the gentleman is in trouble. The earth's machine is the nature of the earth. In other words, a gentleman carries things with his kindness. The earth's machine is the gentleman's kindness. He who hits the water. The water can carry the boat and also capsize it. The water is the disaster. The one who hits the water. It is said that the yin and yang of stone and water are in harmony with each other, and for a gentleman, blessings and misfortunes are intertwined. Those who roll into the east sky are fighting in secret. Ming is the underworld of water, which is darkness.