Wile musical octaves contain 6 distinct notes between a note and its double in frequency: reh, me, fah, so, la, and te the "color octaves" contain 7 distinct colors: Red, Orange, Yellow, Green, Cyan, Blue, Violet, and Magenta.  A new name is required for "color octaves".  From here on in I shall refer to what I have been calling "color octaves" as "Spectrals".

The Visual Spectrum now has a structure of its own. It consists of 22 Spectrals ranging in wavelength from the Fundamental Red at 1.4336 millimeters in wavelength at the beginning of the first Spectral to the end of the 21st Spectral at 683.6 picometers. Each spectral repeats the pattern of colors from Red to and including the next Red. To discriminate between these colors we can refer to them by either their distinct wavelength, or by their Spectral number. Thus Red₀ = 1.4336 millimeters while Red₁₁ = 700 nanometers.

Each spectral is shorter in total width than its preceding spectral. The diagram above shows the "Visible Spectral," S11, and three of its surrounding spectrals: S10, S12, and S13. Put your mouse pointer here to wash out all the invisible colors. Note: Magenta is the Part of S11 that is also invisible.