Color is relative: the same hue is almost never perceived as it physically is

Albers’s foundational thesis is that color is the most relative medium in art: a color is almost never seen as it physically is. Because any color is always seen against adjacent colors, the eye receives a psychic effect that diverges from the physical fact — the same pigment reads lighter, darker, warmer, or cooler depending entirely on its neighbours. Color therefore has innumerable faces that reveal themselves only through interaction and interdependence; saying ‘Red’ to fifty people yields fifty different reds. This is not a curiosity but the fundamental condition of color perception: every color decision is really a relational decision, and the effect cannot be trained away. The practical consequence is that you cannot judge a color in isolation — you must see it against its actual background, at the actual luminance, in the context where it will appear. Albers trained this sensitivity with tightly constrained ‘free studies’ (e.g. produce many perceived effects using only four colors), on the principle that constraint yields more variety than open self-expression.

Examples

Place two identical grey swatches on a bright-yellow ground and a dark ground: each appears to differ in lightness and warmth though the RGB is unchanged. A mid-grey square reads dark on white and light on black. In a shader/GLSL context, changing the background color shifts the apparent saturation or lightness of a foreground shape without altering its RGB values.

Assessment

Place two identical color patches on two different grounds; predict and explain which appears lighter and which darker using the relativity principle. Then explain why this effect cannot be eliminated by color training.