This book guides the reader through perhaps the single most important philosophical work of the twentieth century - Wittgenstein's Philosophical Investigations. The author presents Wittgenstein's Investigations in a radically new light using short sections to clarify the main arguments, including the famous Private Language Argument. This is accomplished through the author's extremely clear and accessible writing style, bringing a new clarity to a reputedly difficult work. The author demonstrates the continuing importance of Wittgenstein's ideas to contemporary debates in cognitive linguistics and psychology.