Eigengrau Is the Color We See in Total Darkness

The color we see in complete darkness is not pure black, instead they see a dark gray called Eigengrau. Seeing Eigengrau instead of black has been studied and repeated many times, but there does not seem to be an explanation about why this is the case. Perhaps this is a baseline noise from the nerves.

An uplifting way to think about this is that the darkness we see is never devoid of light.