"Colours are a great example of how language fragments, splits up, a continuous reality to make its bits available as (symbolic, imaginary, technical) building materials. There is no border between "yellow," "green" and "blue"
More an example of how the brain's visual system fragments the visible wavelength spectrum. Colours are independently perceived categorically by separate and distinct subpopulations of cone cells in the retina. To the human brain, colour is not a continuous reality, but pre-existing fragments, language is simply following the logic of nervous system. There is a very real, physical border between yellow, green and blue at the level of single cells and in the visual cortex arriving from the lateral geniculate nucleus. Language has simpy evolved accordingly to the perceptual categories of the brain, in this sense colour categories are neither symbolic nor imaginary. The borders are real and determined by physiological reality.
