A multi-disciplinary study of the house that the philosopher Ludwig Wittgenstein built for his sister in Vienna between 1926 and 1928, this book weaves together ideas taken from a number of disciplines_sociology, political science, aesthetics, architecture, urban planning, and philosophy_to develop a complex, multifaceted interpretation of the purpose and design of the house, which, in turn, is used to ground a new interpretation of Wittgenstein's philosophical works emphasizing their mystical nature and practical purpose.