Modern architecture is characterized by simplification of form and creation of ornament from the structure and theme of the building. The first variants were conceived early in the 20th century. Modern architecture was adopted by many influential architects and architectural educators, however very few "Modern buildings" were built in the first half of the century. It gained popularity after the Second World War and became the dominant architectural style for institutional and corporate buildings for three decades, covering practically most of the Cold War era.
The exact characteristics and origins of Modern architecture are still open to interpretation and debate.