 But more importantly, some of the horizontal self-subsisting and incorporeal dominating lights are identified as formal dominating lights, as ‘Lords of Species’ (archetypes) or ‘idols’ (arbab al-asnam): “though they are not imprinted in the barriers (bodies), they occur from each master of an idol in its barrier shadow with respect to some exalted luminous aspect” (PI, 155). These are, at times, labelled the Platonic Forms (muthul Aflatun) (located perhaps at the lower threshold of the world of souls), which Suhrawardi incorporates into his metaphysics, over which rules the Light of Lights (PI, §§246–8; Suh. 1999, 111). Each of those eternal, unchanging and pure luminous lights can differ in kind without differing in ontological level. They are “lights of equal strength” that “differ from others of the same strength by luminous and dark accidents”, some of the lights of this horizontal order being “the efficient, not the formal, causes of natural kinds” (Walbridge 2017, 270; Suh. 1993a, 67–8; PI, §§94–5, 164–71). The function of those Platonic Forms is analogous to the archetypal Forms of Plato, but only in so far as they govern various species whose exemplars they existentiate (rather than being mere universals), such as the species of bodies that move the celestial spheres and being the cosmological efficient causes of all sublunar matters, including human souls (Walbridge 1992, 61–6, 2017, 270–1). 