This book is a study of Wittgenstein's descriptive, improvisational, and performative art of philosophical investigation. In addition to clarifying the nature of Wittgenstein's grammatical investigations, this study highlights several neglected aspects of his work: its humour and playfulness, its collaborative nature, and its emphasis on the imagination. These aspects often become distorted under the pressure of theory and argumentation, resulting in interpretations that equate grammatical investigation with confession, therapy, or a common sense view of the world. After presenting...