Edward Abbey once said that to read Robert Grudin is to experience "the rare and amazing spectacle of man thinking, of mind at work." Part do-it-yourself guide to freer thinking and part playful philosophical inquiry into liberty and creativity, On Dialogue holds forth the model of the mind that "rejects the tyranny of a single system or dogma, refuses to censor Odangerous' ideas, and guards as something precious its own access to joy and laughter."...