* Color Theory: His book "Interaction of Color" is a seminal work on color theory, exploring the ways colors interact and affect each other. It is still widely used today by artists, designers, and students.
* Geometric Abstraction: His paintings, particularly those from his series "Homage to the Square," are known for their simple geometric forms and vibrant colors. He was heavily influenced by the Bauhaus, a school of art and design he taught at.
* Textiles and Weaving: He was also an accomplished textile artist and worked extensively with woven fabrics, often incorporating geometric patterns.
While Josef Albers wrote and lectured extensively on art and design, he did not write novels or other lengthy literary works.
It's possible there is a lesser-known author named Willi Albers, but without further information, it's difficult to say for sure.