When I stand on Earth's surface, the sky is up and Earth is down. When I'm upright in a hole, Earth is in every direction, except up where the sky is, except when someone covers up the hole with earth. In a plane, Earth is still down and the sky is up, but I'm also IN the sky. When I'm upside down, Earth is down and the sky is up. When I'm on the Moon, Earth could be in any direction, but the sky most likely is still up. When I move towards the Earth at 99% the speed of light and I turn on my headlights, the light of said headlights still moves away from me with the speed of light.
Words FTW.
