Additionally, the ontology of Buddhism is broadly and thoroughly discussed in this sutra through the dialogues between the Buddha and his disciples. The “Being” of the world, that is named realness, dharma nature, dharma realm, and so forth, as well as the realm of the inconceivable in this sutra, contains the characteristics of: emptiness, selflessness, non-arising, non-extinction, non-going, non-coming, non-making, non-doing, non-differentiation, and formlessness. These concepts and names, along with other concepts and names, are established provisionally as indicators of all beings, namely, the existents of the world, or as they are described in this sutra, the dharmas. Other establishments, either caused by mental-images or other factors, are based on causes and conditions that are unreal because they have no fixed “natures.” All dharmas of the world and their relationships comprise the phenomenal realm of the world, the “conditioned realm;” they are not separate from the realness or the “Being” of the world, the “unconditioned realm.” The phenomena and the realness are neither the same nor separate; they are rather the two sides of the reality of the world as well as of sentient beings. The original natures of all dharmas, resembling empty space, are like dreams, illusions, mirror images, echoes, illusory images of water under sunlight, flowers in the sky, transformed things, and mirages. These ontological discussions suggest, reasonably and step by step, a metaphysical basis for the fathomless prajna paramita, the main concern and focus of the entire sutra.