Beyond his own exploration of industrial materials, what makes Cruz-Diez’s contribution to Op and Kinetic art so singular, is his unique understanding of color and color-theory. This mastery of color and understanding of the ways in which contrasting hues can produce optical effects or create the illusion of spatial depth was defined by a strong foundation in the science of color and perception. Mathematics, chemistry, and color-theory became central to the artist’s process. He explains, “I tried to combine all my artistic knowledge and the information on the simple phenomenon already studied in chemistry, physics, and optics, to elaborate a platform of work that I’ve tried to develop over the years under the concept that color is an unstable situation in continual transformation.” The artist’s whole career can therefore be understood as an almost scientific exploration of the mutability of color.