The idea of "the correspondence between man and nature" holds that the human body is a small world and a small universe, and some phenomena in nature are also reflected in the human body. For example, there are four seasons in nature. In spring, the weather is warm, trees begin to sprout, grass sprouts, and hibernating animals begin to wake up. Summer is hot and everything is thriving; In autumn, the weather is cool and plants begin to bear fruit. It's freezing in winter, so put everything away. Like the four seasons, the human body has experienced a seclusion period in winter, a slow period of qi and blood circulation, and a vigorous period of qi and blood in midsummer. Then it gradually moved from summer to the dormant room, and the circulation of qi and blood gradually slowed down. In a day, the sun is shining during the day, the temperature is high, everything comes out to move, and the human body has sufficient blood circulation; At night, the temperature becomes lower, all biological activities are suspended, and the human qi and blood run slowly, so it goes to sleep.
The ancients even found the corresponding parts of all natural phenomena in the human body. For example, the sky has the sun and the moon, people have two eyes, the sky is round, and people's heads are round; The ground is square, and people's feet are square; There are 365 days in a year, and the human body has 365 joints and so on.
In fact, some of these corresponding parts are coincidences and some are far-fetched. However, the ancients learned from the principle of "correspondence between man and nature" that the human body must actively adjust itself to adapt to various changes in nature in order to stay healthy, but this idea is very positive and correct.