Summary: This publication presents a wealth of in part unknown colored works on paper by Josef Albers (1888-1976), documented for the first time. It was not until the German-born artist emigrated to the U.S. that he emerged as a prominent artist and influential teacher. Beginning in about 1940, Albers allowed himself to be inspired by Mexico's pre-Columbian architecture, sculpture and textile art, which led to a liberation of his aesthetic sensibilities and to unconventional, radiant pitches of color, the likes of which modern painting in Europe had never seen before. In ca. 1950, he discovered the square, in his eyes the ideal form for color. He was both a resolute painter as well as a color philosopher. Each of the works on paper presented here arouses a sensuous fascination for the phenomenality of color.