 In the second part of the Philosophy of Illumination, Suhrawardi lays out his light ontology. While some parallels can be drawn with the mystical light epistemology of Muhammad al-Ghazali (d.1111) in his Niche of Lights (1998) (cf. PI, §171; Sinai 2016), Suhrawardi develops a distinctly original theory of light. Light and its manifestation are fundamental ontological principles of his complex metaphysics wherein the continuous irradiation from the Light of Lights creates and sustains the unity of reality. 