Tutorial 10 -- color space .... cube for cccN and double-cone for other systems like NCS, Ostwald...

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cccN defines color space as a cube, while other systems ( NCS, Ostwald, Munsell and Itten Color Systems ) define it as a double-cone.
The key difference is the definition of value ( brightness ).
Value formula of cccN = r + g + b.
For this, you easily learn that value is different for all saturated colors.
But, all other color systems in the world say saturated colors are all the same, the highest value ( brightness ).
It is easy to prove that cccN is correct. Wait for more Tutorials.
cccN defines grayscale color as r=g=b. The three primary colors offset each other's brilliance to form the colorless grayscale. So, chroma of grayscale is 0. It means it is far from the brilliant saturated color ring.
chroma = max.(r, g, b) - min.(r, g, b)
Chroma is the degree of brilliance for a color. It makes the world colorful.
Without chroma, the world would seem dull and boring.
value ( brightness ) = r + g + b
White color has the highest value among all and Black is the lowest.
The total number of hues defined by Chuang's color system = 6N, which means ccc1 has 6 hues, ccc2 has 12 hues, ccc3 has 18 hues, ............ ccc15 has 90 hues. There is basically an international consensus for hue number that red=0 (or 360), green=120, blue=240, sub-color yellow=60, cyan=180, magenta=300, sub-sub-colors and so on.
3 primary colors --- Red, Green, Blue
3 secondary colors --- Cyan, Magenta, Yellow
6 tertiary colors ---
12 fourth-level colors ---
莊氏顏色系統的色調總數 = 6N
意即 ccc1有6個色調, ccc2有12個色調, ccc3有18個色調 , .............. ccc15有90個色調, 色調號國際上基本上已經有共識了 紅色=0 ( 或360), 綠色=120, 藍色=240, 中間色黃色=60, 青色=180, 品紅=300, 次中間色依此類推.