From the article: //(Diagram) Josef Albers, Folder IV-1 Actually, the squares are exactly the same color! The surrounding context dictates the perceived color,

From the article: //(Diagram) Josef Albers, Folder IV-1 Actually, the squares are exactly the same color! The surrounding context dictates the perceived color, on top of all that wavelength-physiology we just did.// There's a difference between a color and a perceived color? To add to the absurdity, I don't think you can argue that the example presents the same stimulus! Maybe the author regards the term "color" as having a meaning in the sense of common-sense, except in this sense the common-sense sense of the sense has no common sense.