"No Trust, No City!" was the longtime credo on their website; "Some Ideas for Better Cities" was their first joint lecture series; and Acting in Public was their first book. For over twenty years, the architecture collective raumlaborberlin has been searching for new spaces of encounter and for ways of achieving cooperative urban development. Together with experts from various disciplines, they experiment with new forms of urban practice, participation, and the joint production of space. Polylemma explores the work of the collective from diverse perspectives. Its nine members visit the sites of their work, come together with long-standing colleagues and critics, dissect the mechanisms behind their actions, and reflect on the tools and