Eigengrau

"I will tell you a secret. Sit in your cell, Disciple, and observe the night sky through your lone window. Note the brightness of the stars, and the darkness of the void beyond. Now close the window, extinguish your lamp, let no light touch you.  Behold, the darkness is not quite dark; the night sky was darker than the lightlessness you see. Subtle and dubious is the difference, but full darkness is not full darkness at all. From whence does this not-light come? I tell you, Disciple, the light you see is no worldly light; look into absolute dark, and the light you see is your own self."

- From The Fivefold Discipline of Aldonis of Evandra, "The Weaver of Five Strands"