From the High Line in New York to the intoxication of heights in Linz: For many years, art and the urban space have been interacting in new ways, conquering hitherto neglected areas of town. In 2007, OK started to expand its radius and launched a new form of exhibitions in Linz. This book tells the success story of the popular exhibition series that changed not only OK as an institution, but also a part of downtown Linz itself. Celebrated international artists, architects and urban planners report on their experiences with urban interventions and analyse the Linz format. English and German text.