Inanimate objects, animals, plants, humans, souls, immortals, and even beings beyond the immortal realm are all forms of existence for living entities, and all serve as vessels for cultivation.
When a human body's life ends, it marks the end of a living entity's cultivation in three-dimensional space. The living entity then uses the soul as its vessel to cultivate in the four-color space. Once the soul's cultivation reaches its limit, the living entity may enter the four-dimensional space and become an immortal, or return to three-dimensional space, using the energy it possesses at that time to become an inanimate object, a plant, an animal, or a human, and continue cultivating in three-dimensional space. This is known as the Three Paths of Reincarnation.
Dao medicine treats the body and mind, the prevailing customs of the world, the imbalance of the Five Elements and yin and yang in all things, and the disharmony between the land and the cultivation of living entities.
Using scientific principles and specific people and events, this book explains the essence of the Three Paths of Reincarnation and what it means to become a ghost or an immortal. It is a popular science book, not fantasy.
This novel and its characters are entirely fictional. Any resemblance is purely coincidental. Do not imitate.