To Know the Body, Study Nature. The body is visible and the body is invisible. The lips can be seen. The breath is unseen.
Blood is visible.
Qi is invisible. It was born in China over four thousand years ago. Today, it's also practiced in Japan, Korea, Vietnam, and the rest of Asia. But its methods have no geographic bounds. Herbal drugs used in Chinese medicine don't only come from China, they come from all over the world.