Exposed concrete is not an ordinary construction material but a deliberately used design element that showcases the structure, texture, and color of concrete. The quality of formwork largely determines the result: wooden boards leave grain patterns, smooth steel formwork produces a homogeneous surface. Standards distinguish exposed concrete classes SB1 to SB4, defining increasing requirements for flatness, pore content, and color uniformity. Famous proponents include Le Corbusier, who coined the term Béton Brut, and contemporary architects like Tadao Ando. Despite aesthetic qualities, exposed concrete requires careful planning regarding moisture protection and carbonation.