The School of Yin-Yang is an ancient Chinese philosophy that emerged during the Warring States period (475-221 BCE). It is a cosmological and metaphysical synthesis that seeks to understand the nature of the universe and the relationship between opposing forces.

The origin of the School of Yin-Yang can be traced back to the teachings of the legendary Chinese philosopher and sage, Laozi. Laozi is credited with writing the foundational text of Taoism, the Tao Te Ching, which explores the concept of the Tao, or the Way, as the underlying principle of the universe.

In the Tao Te Ching, Laozi introduces the concept of yin and yang as complementary forces that are in a constant state of flux and balance. Yin represents the feminine, dark, and passive aspects of the universe, while yang represents the masculine, light, and active aspects. These two forces are interconnected and interdependent, and their constant interaction gives rise to all things in the universe.

The concept of yin and yang was further developed by the philosopher and statesman, Confucius, who emphasized the importance of balance and harmony in all aspects of life. Confucius believed that understanding the relationship between yin and yang was essential for achieving balance and harmony in society.

During the Warring States period, there was a growing interest in cosmology and metaphysics as a means of understanding the chaotic and tumultuous world. This led to the emergence of various schools of thought, including the School of Yin-Yang.

The School of Yin-Yang was founded by the philosopher Zou Yan, who synthesized the teachings of Laozi and Confucius with other philosophical and cosmological ideas of the time. Zou Yan believed that everything in the universe could be explained by the interaction of yin and yang, and he developed a system of correspondences between these forces and the natural world.

The School of Yin-Yang became widely influential during the Han Dynasty (206 BCE-220 CE) and was incorporated into the official state ideology. It continued to evolve and influence Chinese thought throughout the centuries, and its principles can still be found in various aspects of Chinese culture, including medicine, art, and philosophy.

In conclusion, the School of Yin-Yang originated from the teachings of Laozi and Confucius, and was further developed by Zou Yan during the Warring States period. It remains an important philosophical and cosmological framework in Chinese thought, highlighting the interconnectedness and balance of opposing forces in the universe.