And then the relations between the particles, be it because of their own volition or not, engender emergent phenomena, say the diffusion of energy that produces chain reactions, which at scale create higher forms of being that range from the atomic to the molecular level, then the parts of a body, such as human organs, then the body as a whole—human as such—and so on. Second, and related to the problem of defining “substance”, we conceive of a system as factors in their interplay rather than a mere set of factors. The organs are an emergent reality, derived from the atomic level, as is the dog which comes into being from the joint operation of its organs in light of specific favourable conditions that enable its presence.