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In 1666 AD, Isaac Newton passed a ray of sunlight through a prism and split the white light into a rainbow spectrum of colors.

red, orange, yellow, green, blue, indigo, violet ...

All of these colors of light waves have their own unique wavelength.

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But there is no brown color in the spectrum! 

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no such thing as the wavelength of brown

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"brown" is our internal representation of the mixture of other colors

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the color brown is our invention, and begins and ends within our mind

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brown (and in fact all color) is the way our mind represents the physical property of the wavelength of a light wave


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