What is Reality? Why is Being and not Nothingness? What is truth? These are important philosophical questions. From the perspective of Hua-yen and Zen, Nishitani Keiji exposits the answer of these questions. Nishitani Keiji's philosophy of nothingness is one kind of the philosophy of reality', that is a contemporary interpretation of Buddhist teaching and one way to conversation with Heidegger's thinking of Being.