Against a background of urban aestheticization, the following study addresses questions of urban formation and change. The aim of the thesis is to investigate how an activist urban configuration, in this case the so-called "Free Town of Christiania" in Copenhagen, may affect a more general urban planning and design discourse, as well as the aesthetic assumptions behind contemporary spatial practice. The working hypothesis of the study is that an actualization of expressive urban activist practices will lead to a different conception of spatial development and change than the one presently dominating the field of urban planning. It is also anticipated that the conceptual prerequisites for urban planning and design may be altered through a radical interrogation of aestheticization processes, as they have appeared through a controversial and in many respects illegitimate 'taking of place.' The objective of the thesis has therfore not been the assessment of the specific urban formation as an ideal solution to urban life. Instead the study should be seen as a problematizing interrogation through a concrete example of the complex relation between expressive aesthetic action, spatial reproduction, and the representational power of form. The study is undertaken in the conviction that urban formation is an intermediary and composite practice that cannot be understood in isolation from social, linguistic, material, and political realities of expressive actions. Methodologically, this means that the present work is articulated within the paradigm of performativity, theorizing urban locality production from three different perspectives: the formlessness of the subject, the formlessness of space and the formlessness of power, all of which constitute a tactical dissassembly of the privileged notion of urban form. As such, the thesis aims at introducing a more elaborate and critically resonant aesthetic discussion into urban discourse, actualizing the creative potential of re-conceptualizing urban planning and design as intermediary as-if spaces of social and political interaction.