Why is Brown not on the color wheel?

Related questions

1. What color looks best with turquoise?
2. Can Capricorn wear turquoise?
3. Is red a boy or girl color?
4. Is Brown a warm color or cool color?
5. Does pink and teal go together?
6. Is the color turquoise blue or green?
7. Does turquoise turn green with age?
8. Why is blue a cool color?
9. Is Hubei turquoise valuable?
10. Is Teal closer to green or blue?

Tags

1. #color
2. #darker
3. #shade
4. #colors
5. #brown
6. #means
7. #actually
8. #shows
9. #complementary
10. #mixing
11. #together
12. #wheel
13. #create
14. #either
15. #yellow
16. #orange
17. #combination