The theory of Yin-Yang holds that the world is material and that this material world evolves constantly as the result of the mutual action of two opposing material forces. What is Yin-Yang? At its origin, the terms were used to designate the two slopes of a mountain. The sunny side was Yang and the shady side was Yin. Later, their meaning broadened to include all opposites. All natural events and states of being are rooted in Yin and Yang all aspects of the natural world could be seen as having a dual aspect, for example, day and night, brightness and darkness, movement and stillness, heat and.
