Rem Koolhaas has been part of the international avant-garde since the nineteen-seventies and has been named the Pritzker Architecture Prize for the year 2000. This book, which builds on six canonical Koolhaas projects, traces the discursive practice behind the design methods used by Koolhaas and his office OMA. It uncovers recurring key themes—such as wall, void, montage, trajectory, infrastructure, and shape—that have structured this design discourse over the span of Koolhaas's oeuvre. The book moves beyond the six core pieces, as well: It explores how these identified thematic design principles manifest in other works by Koolhaas as both practical re-applications and further elaborations. In addition to Koolhaas's individual genius, these textual and material layers are accounted for shaping the very context of his work's relevance. By comparing the design principles with relevant concepts from the architectural Zeitgeist in which Koolhaas has operated, the study moves beyond its specific subject—Rem Koolhaas—and provides novel insight into the broader history of architectural ideas. Ingrid Böck is a researcher at the Institute of Architectural Theory, Art History and Cultural Studies at the Graz University of Technology, Austria. Published with the generous support of the Austrian Science Fund (FWF).