Why are red and blue portrayed as opposite colors (like opposite teams or opposite forces or opposite whatever) when the actual opposite of red is a much lighter shade of blue? It's even used for the polarity on magnets. Is it because the idea of red and blue being opposite was instilled so early on in life that, despite the truth being different, people decide that red and blue must oppose eachother? Maybe it's that they just like that paid of colors. Or possibly the lighter shade of blue and the darker shade of blue are the same in a way, you catch my drift?
i've never known red and blue to be opposites, nor have i been aware of a widespread belief that they are opposites. but i can see why they are great choices when you need 2 strong colors and you need them to be different from each other. if you try to use one light color and one dark color, that will probably create visibility problems because they won't work well on the same background