Jung, a Swiss psychologist, found many similarities between the subconscious content of modern people and the psychological characteristics of primitive tribes through the investigation and comparison of many nationalities, and thus put forward the theory of collective subconscious:

In the long process of historical evolution, the accumulated experience of human ancestors from generation to generation will be maintained and passed down in the form of original images.

Collective experience is at the bottom of human spirit and is universally owned by human beings, but individuals never realize it in their lives and get it through heredity.