Ive done some scripts to look for patterns. Try crossing your eyes to blur your vision while looking at these big. This sometimes can help you seen patterns.

Check out the 4graph page

[Window width:   *400*   640   800   1024   1200   1600   ] [Image size:   XS   *Small*   Medium   Large   ]

caps=black; lowercase=white; There are clear vertical lines in this one at ~4 charecter spacing which is why we ran the next image (seen best probably on small images). caps=black; lowercase=white; red=devider every 4 char.