There is none.
The 'Z's snuggled cozily with the 'L's, even as the spectacular 'Is's occupied those elusive voids which have always been left incomplete. And then I saw the beautiful pattern being completed. There were no voids. No spaces. No white places which required reason. The completed pattern imprinted itself in my mind in a way, I knew, I could never be freed of the haunting memory. The thought of the pattern gives me goosebumps even now - when I'm almost entirely sure that I will never again be able to replicate such splendor. Magnificent in its magic, Life is. Much like Tetris.