More comparative color. Joseph Albers from "Interaction of Color". The 3 backgrounds are the same colors but react differently due to the different colors in the middle. Josef Albers was a German-born American artist and educator at the Bauhaus whose work on color theory, both in Europe and in the United States, formed the basis of some of the most influential and far-reaching art education programs of the 20th century
http://bauhaus-online.de/en As the first academy for design in the world, the Bauhaus brought together the most outstanding artists, graphic artists and designers, theatre people and architects. It was simultaneously a production site and the focus of international discussions. You can read all about the teaching and the workshops, the locations of Weimar, Dessau and Berlin and the three directors Gropius, Meyer and Mies van der Rohe.