  It should be noted that it is in reference to the above chart of the celestial levels of stars and planets that we find in various medieval Muslim and Jewish thinkers—for example in al-Farabi and in Maimonides—a Neoplatonized Aristotelian focus on a hierarchy of “separate intellects,” the last of which (generally construed as the 10th intellect lowest down—with God conceived either as the first such Intellect or as an Intellect above this enumeration altogether) being described as the “Active Intellect” which governs the sublunar realm, and is that to which human minds “conjoin” (through the process of  ittisâl).[32] It is important to distinguish this system from the one at play in Ibn Gabirol: whereas al-Farabi, Maimonides, and others focus their attention on a Return to (or a “conjunction with”) the 10th lowest down of the separate intellects (the Active Intellect as the intellect associated with our earthly realm below the moon), Ibn Gabirol's focus is, as in Plotinus, on an Intellect at the very heights of the celestial world, and just outside of God's own being: Whereas Ibn Gabirol's “10th sphere” is a Sphere of Intellect just outside of God, Maimonides' “10th Intellect” corresponds to the sphere of Moon (just above Earth). This point is often confused in secondary literature, and can lead to problematic misunderstandings and misconstrued correlations between philosophical systems.