In this integral philosophy (inspired in part by the works of Plotinus, Hegel, Sri Aurobindo, Eric Jantsch, and many others) reality is said to consist of several realms or stages, including more than one of the following: the physical, the vital, the psychic, (after the Greek "psyche", "soul"), the causal (referring to "that which causes, or gives rise to, the manifest world"), and the ultimate (or non-dual), through which the individual progressively evolves.