 Natural theology also flourished in the pre-colonial period, especially in the Advaita Vedānta, a darśana that identifies the self, ātman, with ultimate reality, Brahman.  Advaita Vedāntin philosopher Adi Śaṅkara (fl. first half eighth century) was an author who regarded Brahman as the only reality, both the material and the efficient cause of the cosmos. Śaṅkara formulated design and cosmological arguments, drawing on analogies between the world and artifacts: in ordinary life, we never see non-intelligent agents produce purposive design, yet the universe is suitable for human life, just like benches and pleasure gardens are designed for us. Given that the universe is so complex that even an intelligent craftsman cannot comprehend it, how could it have been created by non-intelligent natural forces? Śaṅkara concluded that it must have been designed by an intelligent creator (C.M. Brown 2008: 108).