The Western tradition has tended to identify thinking with the purely logical, excluding other kinds of thinking (such as thinking by analogy, correlation, imaginative simulation) from philosophy, without denying their indispensability in the conduct of life. The central argument of Unreason Within Reason is that it is this endeavour to detach the logical from other kinds of thinking which has led to the present crisis of rationality, in which reason seems everywhere to be undermining its own foundations.