 On the basis of this theory Grosseteste developed a cosmogony and cosmology. He saw in the metaphysics of light insight into God’s creation of the physical universe and an explanation of why it took the form it did. At the beginning of time, Grosseteste asserts, God created first form or light in first matter.  First form and first matter are in themselves indivisible and simple, and according to Grosseteste the finite multiplication of a simple cannot generate an item with size (quantum). But, he thinks, the infinite multiplication of a simple will generate a finite quantum.  Thus, through the infinite multiplication of first form in first matter extended bodies, and thus the physical universe, were produced.  To account for bodies of different sizes, Grosseteste posits that there are infinities of different sizes (see below) that stand in different ratios, numerical and non-numerical, to each other. Thus, “light by the infinite multiplication of itself extends matter into larger and smaller finite dimensions that stand to one another in all ratios, numerical and non-numerical” (Lewis 2013, 241–242).