The three primary colors correspond to the three fundamental shapes: yellow to triangle, red to square, blue to circle

Itten proposes an expressive correspondence between fundamental shapes and primary colors based on shared phenomenal qualities. Square: right angles, gravity, limitation, matter — corresponds to red (weight, opacity, material). Triangle: diagonal directions, aggression, thought — corresponds to yellow (weightless, penetrating, intellectual). Circle: smooth unending motion, spirit, relaxation — corresponds to blue (passive, transparent, infinite). Secondary shapes and colors follow: trapezoid/orange, spherical triangle/green, ellipse/violet. When form and color are coordinated by these correspondences, their effects are additive — expression is reinforced. When a composition emphasizes form (Cubists), colors may be reduced; when color is primary (Impressionists), forms dissolve. A practical heuristic: sharp angular geometry suits warm aggressive colors; curved flowing geometry suits cool passive ones.

Examples

In Hydra: shape(3,0.4).color(1,1,0) — triangle + yellow, concordant. shape(4,0.4).color(1,0,0) — square + red, concordant. Try shape(3,0.4).color(0,0,1) — triangle + blue, discordant tension.

Assessment

Identify the shape-color pairs for all six primaries and secondaries; design a generative composition where form and color expressions are deliberately discordant; explain the Cubists’ reduced color palette in terms of this theory.