In this simple model, the colors are maped on x,y,z coordinates at a ratio of 1/1 to R, G, B values. The genius of this method is to attache this color model to 3d space as they both can be reduced to 3 components.
The colors Red, Green and Blue are the components that combine to create all additive colors. (See Additive color or additive mixing). The cube define the limit of this procedural space. We can see and predict all the colors inside the cube by using their coordinates. This is also an unique perspective to have a global view of a potentially infinite ecosystems of values.
This is the basic idea behind a 3D lookup table. Where you can change, or translate each matrix value. This kind of method is not limited to colors. It can used with anything that can be reduced to 3 quantifiable component.
https://en.wikipedia.org/wiki/Additive_color https://en.wikipedia.org/wiki/3D_lookup_table https://en.wikipedia.org/wiki/Cube
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