太极图外圆象征太极，内以S曲线分黑白环弧形，白为阳，黑为阴，白中有一黑点，表示阳中有阴,黑中有一白点,表示阴中有阳。阴阳互根，环弧形如两鱼交游状，以示阴阳变化循环不已。

　　The Taiji diagram, commonly known in the West as "the yin-yang symbol," illustrates the unity and interdependence of yin and yang within the Dao. The circle represents the Dao and the white represents the Yang and the black the Yin. That a yin dot is in the yang side and Yang in the Yin represents the idea that yin energy begins to rise from its lowest level when yang is at its height. Likewise yang begins to rise when yin is at its height. This is most evident in the cyclical movements of the seasons: the first signs of spring begin to appear immediately after winter has peaked and begun to subside.