The theory of five elements is a concept of matter in ancient China. The five elements include metal, wood, water, fire, and earth. The theory of five elements emphasizes on an overall concept, describing the structural relationships and forms of movement of matters. The theory holds that everything in the universe is based on the movement and change of these five elements. These five elements interact with each other, affecting a person's fate as well as making the universe move in endless cycles. The theory got mature in the Han Dynasty and was widely employed in the fields like traditional Chinese medicine, architecture, and martial arts.