Josef Albers (1888–1976) was a pioneer of Concrete Art and one of the key players in geometric-abstract painting from the 1920s onwards. In 1933, after teaching for many years at the Bauhaus, Albers emigrated to the USA. At Black Mountain College in Asheville, North Carolina, hisstudents included Robert Rauschenberg and Kenneth Noland. Albers is perhaps best known for his series “Homage to the Square,” in which he sought to demonstrate the interaction of colors. His group of “Structural Constellations” draws attention to the principles of spatial perception.