Once every four or five years, I find a book that is a genuine life-changer. Impro by Keith Johnstone joins my extremely short list of such books. The book crossed my radar after two readers mentioned it, in reactions to the Gervais Principle series Impro is ostensibly a book about improvisation and the theater. Depending on where you are coming from, it might be no more than that, or it might be a near-religious experience.
