  Maimonides criticizes this account in two ways. First if the originator of a causal sequence is one and simple, there is no way for complexity to arise, and everything else in the sequence should be one and simple as well (GP 2.22). Even if the sequence contains thousands of members, there is no way to account for the complexity of a celestial sphere, which is a composite of matter and form. When we get to the inner spheres, we have to account for even more because not only is there the sphere itself but the stars or planets attached to it. They too are composites of matter and form. How can we have such complexity if we start with something that is radically one?