Yin and Yang
In learning oriental treatment, an understanding of Yin and Yang is imperative. Yin and Yang are 2 universal forces, which contradict each other and yet depend on each other. However, it must always be borne in mind that Yin and Yang were conceived of as an entity and that both together were ever present. For example, day (yang) changed into night (yin), light (yang) into darkness (yin), spring and summer (yang) into fall and winter (yin). The properties of Yin and Yang are as follows :