Along with al-Farabi, he was the major target of al-Ghazali's The Incoherence of the Philosophers.
This philosopher proposed three types of essence: those that exist in the external world, those that exist in the mind, and those that have no mode of existence. He has sometimes been considered a mystic because of the last sections of his Pointers and Reminders. His magnum opus is an encyclopedia of science and philosophy whose title indicates that it is meant to cure ignorance. This philosopher argued for the existence of the soul with a (*) thought experiment about a man suspended in the air with no sensory awareness, his "floating man" thought experiment. Along with al-Farabi, he was the major target of al-Ghazali's The Incoherence of the Philosophers. For 10 points, name this Islamic Golden Age philosopher who wrote the The Book of Healing and The Canon of Medicine.
This philosopher proposed three types of essence: those that exist in the external world, those that exist in the mind, and those that have no mode of existence.
Avicenna [or ibn Sina] 