"Hayek’s early work as a student in psychology (mostly before Wittgenstein’s Tractatus was published) led him to ask himself the questions: "What is mind?" and "What is the place of mind in the realm of nature?" Hayek essentially adopted a Kantian view of the nature of the world. He saw mind as implanting order on the world rather than the world necessarily having any properties of, as it were, itself. In The Sensory Order, Hayek wrote that if the "account of the determination of mental qualities which we have given is correct, it would mean that the apparatus by means of which we learn about the external world is itself the product of a kind of experience." Hayek did not ultimately ascribe much significance to the brain as an accurate (whatever, in this circumstance, accuracy would be) receptacle of reality. Reality, such as it is, is what brain makes of it. This Kantian ontological (theory of being) perspective had, in Hayek’s view, significant philosophical consequences or repercussions for epistemology. Since there is no ultimate reality apart from what brain makes of it, knowledge is not of ultimate essences but merely of mental states that themselves are liable to change during the lifetime of an organism or over the evolution of a species. Hayek’s ontology ultimately reduces the role of absolute knowledge absolutely."