A Day in the Life

Shield your eyes

The optical illusion below is taken from here (thanks donny).

If you care to hurt you eyes, venture further ...

Upon closer inspection, I concluded that the lines were offset by a pixel. In effect, I didn't really believe that the illusion was kosher. When I saved the bitmap and enlarged it, however, it turned out that it was real; the lines continued seamlessly. But (!), even when enlarged, they seemed to still be off by a single pixel. If so, this means that the illusion is at least partly a result of the way the monitor displays the adjacent colors.

Have the surgery drugs messed with my mind, or is my monitor actually displaying the colors differently than I would expect?