 In his later metaphysics, Whitehead revolted against the bifurcation of the world into the objective world of facts (as studied by science, even a completed science, and one not limited to physics, but stretching from physics to biology to psychology) and the subjective world of values (aesthetic, ethic, and religious), and he promoted the harmonization of the abstractions of science with those of art, morals, and religion, as well as the inclusion of more concrete intuitions offered by our experience—stretching from our mathematical and physical intuitions to our poetic and mystic intuitions. Closely linked to this completion of the metaphysical scheme of thought (cf. Part I of Process and Reality), Whitehead refined his earlier ontology, and generalized his earlier theory of perception into a theory of feelings. Whitehead’s ultimate ontology—the ontology of ‘the philosophy of organism’ or ‘process philosophy’—is one of internally related organism-like elementary processes (called ‘actual occasions’ or ‘actual entities’) in terms of which he could understand both lifeless nature and nature alive, both matter and mind, both science and religion—“Philosophy”, Whitehead even writes, “attains its chief importance by fusing the two, namely, religion and science, into one rational scheme of thought” (1929c [1985: 15]). His theory of feelings (cf. part III of Process and Reality) claims that not only our perception, but our experience in general is a stream of elementary processes of concrescence (growing together) of many feelings into one—“the many become one, and are increased with one” (1929c [1985: 21])—and that the process of concrescence is not primarily driven by the objective content of the feelings involved (their factuality), but by their subjective form (their valuation, cf. 1929c [1985: 240]).