Book excerpt: The complex and shifting relation between regionalism and modernity With its search for purity, honesty, modesty, and ‘fitness of purpose', the late 19th and early 20th century concept of architectural regionalism is seminal to the modern movement. In later historiography, however, regionalism in Europe was neglected and even labeled ‘backward'. The origins of this drastic change of perception can be traced to the 1930s, when regionalism as a positive form gradually turned into a ‘closed' form of regionalism, a folding back on one's own region as a defence mechanism in an economically and politically turbulent decade.