Comment by ertgbnm

Light can absolutely be more blue or more green in an objective sense. Either it is closer to blue on the spectrum or it's closer to green. It doesn't matter if you have intermediate categories in between.

To poke a whole in your analogy, a more apt comparison would be to a gradient of sweetness, where one can indeed describe a flavor as "more sweet" or "less sweet" relative to apples and bananas.