Emerging in the 1920s and 30s, the international style possessed three major principles: the focus of volume over mass, balance over symmetry and minimalism over ornamentation. The international style focuses on the stylistic and aesthetic properties of Modernism and came to be adopted by the modern movement as a whole.
The international style was an off-shoot of the Bauhaus movement, which sought to apply the philosophies and ideals developed in modern architecture to other objects. It incorporated machines and production design as positive elements of the design process, rejecting precedent. This philosophy influenced modern architecture's reaction against eclecticism, which threw together a number of elements from various art periods into the elaborate decorations of building.
Developed from modernist architecture, Brutalism is characterized by the hard, repetitive angles created in the building shapes. While the material associated the most with Brutalism is concrete, the style focuses on displaying the texture of any given material that makes up the building. The structural elements will also be exposed.