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The idea that colors are made up by the brain is indeed an interesting concept. This idea has always fascinated from when I first learned about color blindness in 7th grade. If colors are made up in the mind, does this mean that everyone can potentially have a different idea of what "red" or any other color looks like? Could I perceive a certain light intensity differently than someone else but we would still be calling it the same color of "red"?

Also, the idea of color being constructed in the mind can also be confirmed by what we know of synaesthesia. People with color-grapheme synaesthesia see colors that are not physically present when they see a certain letter/grapheme that does not appeared to be colored to non-synaesthetics. Thus, this shows that the mind is fully capable of creating colors that appear to be of the physical world.