windows. empty holes. openings that admit light and air. means of access, escape, or observation. time considered optimal to start or finish something.
windows in themselves are nothing but a hole in time or space; it is only in being nothing that they are useful.
"when there is nothing between us and God, our faces shine with His glory. we are transfigured much like Jesus was, and our lives are gradually brighter and more beautiful as we become like Him." 2 corinthians 3:18, paraphrased