The concept of yin yang
yin – simplified Chinese: 阴; traditional Chinese: é™°
yang – simplified Chinese: 阳; traditional Chinese: 陽
um yang – in Korean; often referred to in the west as yin and yang is used to describe how seemingly disjunct or opposing forces are interconnected and interdependent in the natural world, giving rise to each other in turn.

The concept lies at the heart of many branches of classical Chinese science and philosophy, as well as being a primary guideline of traditional Chinese medicine, and a central principle of different forms of martial arts and exercise, such as baguazhang, taijiquan, and qigong. Many natural dualities – e.g. dark and light, female and male, low and high – are cast in Chinese thought as yin yang.