<P> Timothy Leary coined the influential term Reality Tunnel, by which he means a kind of representative realism . The theory states that, with a subconscious set of mental filters formed from their beliefs and experiences, every individual interprets the same world differently, hence "Truth is in the eye of the beholder". His ideas influenced the work of his friend Robert Anton Wilson . </P> <P> The status of abstract entities, particularly numbers, is a topic of discussion in mathematics . </P> <P> In the philosophy of mathematics, the best known form of realism about numbers is Platonic realism, which grants them abstract, immaterial existence . Other forms of realism identify mathematics with the concrete physical universe . </P> <P> Anti-realist stances include formalism and fictionalism . </P>

Who is the philosopher that believed that the ultimate nature of reality is numbers
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