 Green’s form of spiritualism is thus not incompatible with ontological dualism: the object of all knowledge is the complete and eternal order of things, which must be constituted by an intelligence greater than that of any individual human being, but individual human beings are in fact organisms, thus matter, to which some aspect of that intelligence is communicated. The epistemological aspect of Green’s idealism is complete, because knowledge on the part of an individual is understood as consisting in a grasp of an order that is itself mental, but his ontology is not exclusively mentalistic, for while it includes the necessary existence of a supra-individual intelligence or spirit but allows the existence of animal organisms (and thus presumably of other forms of matter as well).