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.
But there is no brown color in the spectrum!
no such thing as the wavelength of brown
"brown" is our internal representation of the mixture of other colors
the color brown is our invention, and begins and ends within our mind
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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