The manifestation of yin and yang from the macrocosm to the microcosm

In the universe, the pure yang qi ascends to converge and form heaven, while the turbid yin qi descends and condenses to form the earth. Yin is passive and quiet, while the nature of yang is active and noisy. Yang is responsible for expanding and yin is responsible for contracting, becoming astringent, and consolidating. Yang is the energy, the vital force, the potential, while yin is the substance, the foundation, the mother that gives rise to all this potential.

Extreme heat or extreme cold will transform into its opposite. For example, on a hot day the heat will rise, causing condensation and eventually rain and therefore cold. Coldness produces turbid yin, heat produces the clear yang. If the clear yang qi descends instead of rising, problems such as diarrhea occur in the body. If the turbid yin qi becomes stuck at the top and fails to descend, there will be fullness and distension in the head. These conditions are imbalances of yin and yang... Taste is a yin quality and has a descending nature, while qi is yang and rises to the upper orifices. Heavy tastes are pure yin, light tastes are considered yang within yin. The heavier qi is pure yang in nature while the lighter qi is yin within yang.