Did you ever notice that everything just is what it is, until we compare it to something else? This is one of the Universal Laws, the LAW OF RELATIVITY.
Dark is considered dark only after compared to light. A 6 foot tall person is considered "tall" compared to a 5 foot person, but seems "short" when next to someone who is 7 feet. With neither the 5 foot person nor the 7 foot person, the 6 footer just is. They're neither short nor tall.
We make so many comparisons with