We talked about colours, the colours we mix on the plate are not enough to represent all the visible colours. To have better understanding about the visible colours, I introduced the ICE colour spectrum and the different colour gamuts, RGB, sRGB, CMYK.
references:
Color Wheels are wrong? How color vision actually works
http://blog.asmartbear.com/color-wheels.html
Color Vision: One of Nature's Wonders
http://www.clivemaxfield.com/diycalculator/popup-m-cvision.shtml
Color Space Confusion: 1931 CIE color(x,y) vs 1976 CIE(u’,v’)
http://dot-color.com/2012/08/14/color-space-confusion/