When Janna Levin began writing A Madman Dreams of Turing Machines it was a work of non-fiction. But she realized, as her subjects G�del and Turing had, that the tools of non-fiction — or those of scientific inquiry — were insufficient for discerning truth. As a novelist, Jonathan Lethem traffics regularly in different degrees of truth and is similarly fascinated with what constitutes reality. Recently the two met for lunch at the National Arts Club in New York to talk about this elusive concept — its guises, its enchantments, and how we know it when we see it.
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Video production by Jacob Klein