Not a style. A material. Le Corbusier called the bare formwork-marked concrete of the 1952 Unité d'Habitation béton brut — raw concrete — and a generation of architects took the term as license to stop hiding what a building is made of. Reyner Banham named the result The New Brutalism in 1955. It was never about cruelty. It was about not lying.
What Le Corbusier discovered at Marseille was not invention but acceptance. Postwar France could not afford to clad concrete in stone. The Unité d'Habitation was poured into rough timber forms; when the forms came off, the wood-grain pattern stayed in the surface. He chose to leave it. Béton brut — raw concrete — became a deliberate aesthetic of structural honesty: the building is allowed to look like the building.
The Smithsons in Britain extended the principle to social housing, infrastructure, and civic architecture. Banham's 1955 essay in Architectural Review made the name stick. By the late 1960s, university libraries, city halls, and council estates across the United Kingdom, the United States, Brazil, Japan, and the Soviet bloc were being built in some version of the same vocabulary: massive load paths visible from outside, no applied finish, the geometry of concrete formwork as decoration enough.
It was never popular. It was, however, durable, fireproof, and capable of structural spans nothing else could match at the price. For thirty years, when a public client needed a building that would last and be built on time, this is what they got.
What changed was photography, then politics, then language. Brutalism was photographed in the 1970s in cold rain; it was photographed in the 2010s in golden hour, and was suddenly beautiful. The buildings did not change.
The argument the buildings make has not changed either. The structure can be the surface. The cost of public work can be its honesty. What is permanent need not be polite. Project Lavos's interest in this material is the same as its interest in the grid, the herbal, and the Bauhaus inventory: a discipline that holds up after the trends move on.