There's also no such thing as discrete colors since the visible spectrum is a continuum bounded by ultra violet and short wave infrared. I mean, is blue 488 nanometers or 495 nanometers? Who can say? And the existence of green shows there's no such thing as blue or yellow.
There's no such thing as hot and cold because temperature is a continuum of molecular motion and there exist temperatures described as tepid. Who can say if 95 degrees is hot or if 60 degrees is cold. I'll remember that next time I'm cooking and put my hand in the pot of hot water.
If you ran around day-to-day arguing against categorization of things you encounter in life people would look at you like you're crazy. People categorize things unless they're some sort of radical nominalists. Denying the categorization of people by race has an ideological source/purpose. It ain't a conservative one.
When we talk about the spectrum of light (or EM waves in general), are we not dealing with an abstraction of the mind, the results of quantification? There may be different shades of "blue" and "green," but is it possible for there to be an "infinite" number of wavelengths between 488 nanometers and 489 nanometers?
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