Recent years have seen a growing interest in undetermined and unqualified urban spaces. Understanding cities as spaces for encounter, conflict and otherness, this book argues that this indeterminacy is not marginal but a key characteristic of urban space, and degrees of liberty foster change, creativity, and political action. The urban void is a conceptual construct that aims to render a principle of absence apprehensible, and to describe how it intervenes in place-making in the city.