Darkness, the polar opposite to brightness, is understood to be an absence of visible light. It is also the appearance of black in a colored space.

Humans are unable to distinguish color when either light or darkness predominate. In conditions of insufficient light, perception is achromatic and ultimately, black.

The emotional response to darkness has generated metaphorical usages of the term in many cultures.

https://en.wikipedia.org/wiki/Darkness

"We long to be here for a purpose, even though, despite much self-deception, none is evident."
Carl Sagan
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