A caveat concerning the color of CIE diagram on your monitor

Your color video monitor shows its colors because it has three phosphors (red, green and blue) which are activated by an electron beam. That means that the colors you see can only fall within a gamut (space) enclosed by these three colors.

Look again at the CIE Diagram and notice the black triangle inside of the chromaticity diagram. The apexes (corners) of this triangle approximately represent the location of the phosphors of your color video monitor would plot. Consequently the only colors you can see on your screen are those that fall within this triangle.

The entire chromaticity space has been filled with color only to make it look nice.

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