Everyone sees the many martial arts dojos, traditional Chinese medicine clinics, vitality health training centers, etc use the Yin Yang symbol as their logo. Generally, it is to explain the formation of their school of theory, which is related to the Yin Yang theory. This symbol is the core content of ancient Chinese philosophical thought. It is also the best expression of the Yin Yang theory. It is a high-level summary of the law of the occurrence, development and change of everything in nature.
Now let us think of the shape of the Yin Yang symbol. The shape of the Yin Yang symbol is circular to symbolize that the changing of things is a state of endless movement. The circle is divided into a left and right half, each shaped like a fish. One fish is black, the other is white and they are entangled with each other. The white fish is on the left and the head belongs to Yang. The black fish is on the right and the head is Yin.
This design also expresses traditional Chinese culture. The ancients believed that the left side is the road where the Yang (sun) rises: the right side is the west, which is the road where the Yin (sun) descends. At the same time, the upper Yang of Heaven (Tian qi) needs to fall, and the lower Yin of Earth (Di qi) needs to rise. The white fish and the black fish are separated by a reverse “S” shaped curve, which represents a natural change that is gradual and continuous as opposed to a straight line which would symbolize a change that is abrupt and instant. For example, the breathing of a healthy person is a continuous, gradual and effortless transition of inhale to exhale.
As the white fish and black fish continuously transition, they remain mutually dependent. Neither side can exist without the other. The Yin and Yang sides of something are opposites, unified, coordinated and harmonious yet restrict each other as well. The Yin and Yang jointly maintain the dynamic balance of things in the universe.
大家都会经常看到很多武馆、中医诊所、养生气功等都会用<太极图>作为标志。一般都是为了说明本门派理论的形成，都与阴阳学说有关。这个太极图是中国古代哲学思想的核心内容，也是对阴阳学说的最佳表达方式，是对大自然一切万物发生、发展、变化规律的高度概括。
现在让我们重新回想一下<太极图>的形状，太极图的形状是圆形的，这个圆形象征着事物变化是循环无端的运动状态，圆周内又分左右两个部分，其形状如黑白两条鱼互相纠缠在一起，左侧为白鱼，头向上属于阳：右侧为黒鱼，头向下属于阴。这一设计也表达了中国传统文化，古人认为左侧为东方是阳气（太阳）升起的道路：右侧是西方，是阴气（太阳）下降之路。同时在上的阳气（天气）需要下降，在下的阴气（地气）需要上升，阴升阳降运动不息。白鱼与黑鱼之间由一条反”s”形的曲线分开，这是说明事物变化的阴阳双方，并不是截然以直线的方式分开的，而是彼此相互依赖、相互为用的，同时也是指在事物变化中任何一方都不能脱离另外一方而单独存在，事物的阴阳双方即对立又统一，彼此协调、和谐，而又相互制约，共同维持
着事物阴阳双方的动态平衡。