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Alphabetical
Time
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Hierarchy

According to architects, writers, designers, and assorted people who take time to jot things down on the Internet, Richard Saul Wurman posited that information can only be organized in one of the 5 Hat Racks (or LATCH).

When I learn something like this, I usually enjoy testing it out to see if it’s true / useful. For a brief time, then, the world will look a little bit different, a little bit more interesting, especially if I start to notice the principle everywhere.

More here.