The harmony between humankind and Thing is the normative basis on which ecological balance and stable social development are maintained. With the development of industrial revolution, information technology, and neurosciences, this due harmony has been disturbed by such crises of modernity as the schism between humankind and Thing, the excessive connection between humankind and Thing, and the bewildered in-betweenness of humankind and Thing. These predicaments may lead to consequences like ecological imbalance, moral bankruptcy, emotional distortion, and even the destruction of human beings. In this regard, it is through returning to the "undifferentiated world,"facilitating the mutual exchange between humankind and Thing, and fostering their reciprocal coexistence that the crisis of in-betweenness can be fundamentally solved.