 The vertical hierarchy of immaterial dominating lights interacts with a second horizontal order of dominating lights. Some are equal to others, “because the higher lights possess many luminous aspects or interact with each other, the existence of other equal dominating lights may occur from them […]. Thus, among the dominating lights are mother-lights (ummahat) — the fundamental vertical lights with few and substantial intermediaries — while other are lights horizontal in their ranks from intermediate rays” (PI, §183, 154–5). This second horizontal hierarchy of dominating (qawahir) lights is, at times, associated with ‘managing angels’ (PI, §248, 259, 269–70) (perhaps equal in number to celestial bodies; at times, referring to ancient Semitic angelic hierarchies and Zoroastrian mythology). 