
The eye reads in a “Z” pattern when looking at print, beginning on one line reading left to right and then hopping diagonally backwards to the beginning of the next, and so on in a series of zigzags. Onscreen, it’s a different story. The main difference is that instead of ending up safely in the lower right-hand corner (where an ad is usually placed), the eye returns to the top of the screen. (from The Elements of Internet Style).

