1 + 1 = 3: Explaining Busyness and Background Noise on Websites

Published on Jan 18, 2007 (updated Feb 5, 2024), filed under design (feed). (Share this on Mastodon or Bluesky?)

This and many other posts are also available as a pretty, well-behaved ebook: On Web Development.

“1 + 1 = 3 (or more)” is an important design effect described by Josef Albers and Edward Tufte. It means that two elements in close proximity cause a visible interaction:

Two parallel bars that appear to create a third element. — 1 + 1 = 3. (Copyright Al Globus.)

This interaction can result in perceiving information that is not there. Beside having a negative because distracting and distorting impact on charts and graphics it can also, to use Steve Krug’s words, cause undesirable “busyness” and “background noise” on websites.

Therefore, “1 + 1 = 3” is one of the effects you want to avoid, at least be aware of, when creating graphs and designing websites. (Of course, a designer always wants to keep information design principles in mind.) Edward Tufte’s books are invaluable resources in this regard, and I recommend checking out the following excellent articles:

Al Globus on Principles of Information Display for Visualization Practitioners (German), and
Waynes Smith on Graphics and Web Design Based on Edward Tufte’s Principles (German).

About Me

I’m Jens (long: Jens Oliver Meiert), and I’m a web developer, manager, and author. I’ve been working as a technical lead and engineering manager for companies you’ve never heard of and companies you use every day, I’m an occasional contributor to web standards (like HTML, CSS, WCAG), and I write and review books for O’Reilly and Frontend Dogma.

I love trying things, not only in web development and engineering management, but also in other areas like philosophy. Here on meiert.com I share some of my experiences and views. (I value you being critical, interpreting charitably, and giving feedback.)