“Nash displayed an ironic awareness that his insights were essentially private, unique to himself, and bound to seem strange or unbelievable to others. 'This concept that I want to describe will perhaps sound absurd,' is the sort of preface of which Nash used frequently. His sentences were filled with phrases like 'consider,' 'as if,' 'may be thought of as,' as if he were conducting a thought experiment or realizing that someone reading what he wrote would have to translate it into another language.”