It is an image of Tao, just like Yin and Yang mingling together in the well-known icon . Many people have criticized those definitions of Tao because they fail to express its globality, its trancendent side. One cannot use words to define it, because words are, in a way, mortal. Since greatness implicates extension. Extension implicates distance.
Distance implicates a return.
Listening to it, one doesn t hear it, for we name it the Inaudible. Touching it, one doesn t feel it, for we name it the Impalpable. It is evasive and unseizable. We look at the Tao, and this is not enough to see it. We listen to it, and this is not enough to hear it.