   Al-Kindî is more conventional philosophically in his magnum opus, On First Philosophy, when he highlights the mechanics of perception as proceeding from the sensible object (via the sense organs) to the common sense, imagination and  memory.[7] Elsewhere, he mentions the role of the imagination in both abstracting and presenting images apart from their matter (Ivry, 135). The intellect deals with universals, as mentioned in On First Philosophy, whereas particular, material objects are treated by the senses (and, presumably, the imagination and memory).