Duality.

Noun.

The quality or condition of being dual.

Much of our universe relies so much on counterparts. A bird cannot fly with one wing. Man cannot walk without two legs. A vertex cannot exist without two edges. But duality extends beyond physical limitations.

Land and sea. A world without water would leave us no sustenance to drink. But likewise, a world of oceans would provide no farmland for food provision. With only one, life would eventually die out.

Light and dark. Without shadows, our eyes would be blinded with the abundance of illumination. Without light, our eyes would atrophy from the lack of radiance. With only one, life would eventually die out.

Sun and moon. Without the sun, plants would not grow, slowly choking the life out of us as our oxygen supply is exhausted. But without the moon, days would be shorter, and nights would be darker, slowly sending us into a literal dark age, as our skin would grow pale, and our plants would shrivel up from lack of chlorophyll. With only one, life would eventually die out.

But it is not limited to just nature. Dualities exist in other facets of existence.

Truth and ideals.

Time and space.

Good and evil.

But only one duality has escaped our comprehension. One which continues to elude our every efforts at control.

Life. And death.

One cannot grant eternal life. And one cannot cheat death forever. But even so, we strive to unlock their innumerable secrets, only to discover that every answer brings another question.

But even if we understand these secrets…

What will we be left with?