The style of Modernism is characterised by simple shapes and straight lines. The style reflects the industrialisation of the time, and all unnecessary decorations and ornamentations were removed from the design. The mantras of the Modernist architects were "form follows function" and "less is more"Modernism is also known as Functionalism in the Nordic countries.

Concrete and steel allowed large clear spans and long, horizontal windows. Functionality and flexibility became valuable parameters when creating spaces, homes, and cities.

Several new types of windows were developed during the Modernist construction boom, such as the corner window and the use of Curtain walls – both made possible by the use of reinforced concrete.