Book excerpt: While most studies on the history of architectural theory have been concerned with what has been said and written, this book is concerned with how architecture theory has been created and transmitted. Architecture Thinking across Boundaries looks at architectural theory through the lens of intellectual history. Eleven original essays explore a variety of themes and contexts, each examining how architectural knowledge has been transferred across social, spatial and disciplinary boundaries - whether through the international circulation of ideas, transdisciplinary exchanges, or transfers from design practice to theory and back again. Dissecting the frictions, transformations and resistances that mark these journeys, the essays in this book reflect upon the myriad routes that architectural knowledge has taken while developing into architectural theory. They critically enquire the interstices – geographical, temporal and epistemological – that lie beyond fixed narratives. They show how unstable, vital and eminently mobile the processes of thinking about architecture have been.