A polar concept argument is a type of argument that posits the understanding of one concept, from the mere understanding of its polar opposite. A well-known instance of a polar concept argument is Gilbert Ryle's argument against scepticism (1960). According to Anthony Grayling's characterisation, Ryle's argument can be stated as follows: There cannot be counterfeit coins, (...) unless there are genuine ones, nor crooked paths unless there are straight paths, nor tall men unless there are short men.