What was Qi?
It couldn't be seen, or touched, but it really existed.
The investigation of Feng Shui and topography involved checking the Qi in one area. The Qi here meant the functional activity of Qi in a particular area.
Human beings also had Qi, which determined one's health and how long one would live.
The four diagnostic methods from ancient China, including looking, smelling, asking and checking the pulse, also involved checking one's Qi. When diagnosing a patient, the practitioner would look and observe the patient first. Looking was the most difficult diagnostic method among the four.
An excellent practitioner would be able to detect a patient's health status and illness by observing the patient.
Wang Yao brewed a decoction early in the morning. Unexpectedly, he heard the prompt from the system.
You have reached the criteria of upgrading. Would you like to upgrade your skills?
Of course, said Wang Yao in his mind.