Dana Spiotta said this quote

The repetition of the days did something to you. You knew the monotony, but you couldn't fight it. You had to invent your own repetitions to meet it. A ritual. This early, barely awake kneeling was hers.She looked deep into the black of her closed eyes. Stared into the dark. When your sense of vision has very little stimulation, it invents images. Sarah doesn't know the name for this is the Prisoner's Cinema. It is a trick of the mind, blindness turned into glorious sight. Isolation turned into hallucination. After enough time, she saw a series of lights. The false images are called phosphenes, which means show of lights. But all Sarah knew was that it gave her vibrant colors of great depth, and patterns like a mosaic, like a tiled church floor or sometimes like the spiral of a shell. These visions would not absolve her of her time, her duty, and her deeds. Instead these visions took her through the limits of who she was and what she had done, and for this she felt gratitude, and with this, at last, consolation.