What is there in favor of saying that green is a primary color, not a blend of blue and yellow? Would it be right to say: "You can only know it directly by looking at the colors"? But how do I know that I mean the same by the words "primary colors" as some other person who is also inclined to call green a primary color? No, — here language-games decide.
Intuitively, some colors "feel" like primary colors more than others
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