Twelve-season system
The modern color-analysis framework that splits the four classic seasons into twelve by dominant and secondary trait.
The twelve-season system splits each of the four classical seasons, Spring, Summer, Autumn, Winter, into three, based on which of the three color dimensions, hue, value or chroma, is most extreme in a person's natural coloring. Every season sits at the extreme end of exactly one dimension, its dominant or primary characteristic, while a second dimension sits in a middle position, secondary, and the third stays near neutral, tertiary. That produces four true seasons whose dominant trait is hue, True Spring, True Summer, True Autumn, True Winter, and eight neutral seasons whose dominant trait is value or chroma instead: Light Spring, Bright Spring, Light Summer, Soft Summer, Soft Autumn, Deep Autumn, Deep Winter, Bright Winter. Kathryn Kalisz formalised this structure in the Sci\ART system in 2000, building directly on Munsell's three dimensions, and it has since been adapted by several practitioner schools including 12 Blueprints, each with slightly different color coordinates but the same twelve-category logic.
Why it matters
The twelve-season system is far more precise than the original four-season model, because it accounts for value and chroma as well as hue, catching people whose coloring is genuinely defined by lightness or clarity rather than by temperature alone.