tl;dr: magenta = blue + red Long version: brains interprets green+orange as yellow because they are close enough and it save one kind of photoreceptor ; blue +

tl;dr: magenta = blue + red Long version: brains interprets green+orange as yellow because they are close enough and it save one kind of photoreceptor ; blue + red is not interpred as another color are they are far enough, hence magenta (not a simple color ray)