| Light Red | Light Cyan |
| Red | Cyan |
| Light Green | Light Magenta |
| Green | Magenta |
| Light Blue | Light Yellow |
| Blue | Yellow |
The cells of the diameme tables have been colored according to a scheme that parallels the logical structure. Each table contains a "complementary" pair of propositions (the upper two rows). Likewise, the cells have complementary colors. In color theory, a color is complementary to another when its bright wavelengths are dark in the complement, and vice versa. For instance, red is bright in the red region of the spectrum and dark in the green and blue. The color that is bright in the green and blue is cyan. So red and cyan are complementary colors. The other complementary pairs are blue/yellow and green/magenta. The particular pair that was used for a given diameme is somewhat arbitrary.
The upper rows are lightened to represent their moderation of the exaggerations in the lower rows, which have more 'saturated' colors.
For the 3D or trimeme relationships, the entire set of complementary
colors are used. This analogy between colors and trilogic works because
there happen to be three different pigments in human eyes (red, green,
and blue).