Any irregularity will be interpreted as significant by the user, who will cheerfully ascribe to it a meaning even where none was intended. By regularizing non-critical design elements throughout the work, you will be able to attract the user's attention reliably by introducing an obvious irregularity whenever you do wish to make a distinction.

- Kevin Mullet and Darrell Sano, Designing Visual Interfaces: Communication Oriented Techniques, SunSoft Press, 1995.