what you chose it to be. From the first writings on the rocks to the first purposeful planting of the seeds and to our first expressions of the world. Civilization itself is a human idea we brought into this world. We brought knowledge and enlightenment, science and literature, music and art, right and wrong. We give life meaning ourselves, but it is impossible for one answer to be right for all.
You are who you choose to be.
Spoiler
I f**kin' hate Aliens: Colonial Marines.