We discuss arguably the greatest magical book of the Islamicate tradition, the Shams al-maʿārif al-kubrā or Great Sun of Knowledge. Turns out it isn't by al-Būnī as everyone thought, though there is some Būnī in there; but it has so much to tell us about Islamicate culture, Sufism, and the ‘project of forgetting’ of esoteric Islām among both Muslims and scholars.