How does the eye see colours?

Our eyes contain red, blue, and green cone cells. This means that we only see red, blue, and green. When we see other colours, we are really seeing the combination of two (or three) other colours. For example, when we see yellow, we really see a combination of red and green. Orange would be a combination of green and red, with a higher concentration of red. Green and blue make cyan, and red and blue make magenta. White is a combination of all three, red, green, and blue. When we see any colour, the cone cells of that colour send signals to our brain. For example, when we see yellow, the red and green cone cells would send signals to our brain and we would know that what we see is yellow.