black is achromatic, neutral, having no hue.
black is the color of void, the very epitome of nothingness - the absence of entity.
black is the symbol of uncleanness and impurities.

it is non-deity.
it is the only color that could perfectly capture our existence, for we are the mortals, we are the sinners.

without lights, darkness would still remain.
but without darkness, lights' significance would cease to exist.