In Scandinavia and Finland, the international movement and ideas of modernist architecture became widely known among architects at the 1930 Stockholm Exhibition, under the guidance of director and Swedish architect Gunnar Asplund. Enthusiastic architects collected their ideas and inspirations in the manifesto "acceptera" and in the years thereafter, a functionalist architecture emerged throughout Scandinavia. The genre involves some peculiar features unique to Scandinavia and it is often referred to as "funkis", to distinguish it from functionalism in general. Some of the common features are flat roofing, stuccoed walls, architectural glazing and well-lit rooms, an industrial expression and nautical-inspired details, including round windows. The global stock market crisis and economic meltdown in 1929, instigated the needs to use affordable materials, such as brick and concrete, and to build quickly and efficiently. These needs became another signature of the Nordic version of functionalist architecture, in particular in buildings from the 1930s, and carried over into modernist architecture when industrial serial production became much more prevalent after World War II.