Generally speaking, scientists are materialists. They only believe that scientific equipment or eyes can see and detect things. But in reality, things that are illogical and do not conform to the scientific basis often happen, but they are eager to find the answer, so scientists study metaphysics.

Metaphysics, the word "Xuan" here, comes from a sentence in Laozi, "Xuan is both mysterious and mysterious, and it is the door to all miracles." Metaphysics was originally a term in Taoist philosophy, which refers to a philosophical trend of thought with Laozi as the research core in Wei and Jin Dynasties.

Metaphysics, also known as Neo-Taoism, is the study and explanation of Laozi, Zhuangzi and Zhouyi, which originated in Wei and Jin Dynasties. Metaphysics is a trend of thought advocating Lao Zi and Zhuang Zi in China from Wei Jin to the middle of Song Dynasty. It can also be said to be a new expression of Taoism, so it is also called neo-Taoism.

Its ideological trend lasted from the end of Han Dynasty to the middle of Song Dynasty. Metaphysics was the mainstream thought that replaced Confucian classics in Wei and Jin Dynasties. Metaphysics is "profound learning", which is based on "ancestors narrate Lao Zi and Zhuang Zi", and Lao Zi, Zhuangzi and Zhouyi are called "San Xuan". Taoist metaphysics is also the only knowledge besides Confucianism that has been designated as an official school.