This book reconstructs the theories of matter and space of the mutakallimūn of the tenth and eleventh centuries A.D. It uses texts which have only recently become available. The book presents material which challenges our previous understanding of kalām atomism. In particular, it analyzes the concept of atoms as a 'space-occupying object' without dimension yet having magnitude. It examines the manner of the atom's occupation of space, and discusses arguments for and against unoccupied spaces or the void. A detailed examination of the paradoxical nature of such an atom...