US ZIPScribble Map

Here's a fun project from Robert Kosara, a computer science professor from UNC Charlotte and the author of the Eager Eyes blog. Professor Kosara writes:

What would happen if you were to connect all the ZIP codes in the US in ascending order? Is there a system behind the assignment of ZIP codes? Are they organized in a grid? The result is surprising and much more interesting than expected.

The result of this endeavor is what he calls the ZIPScribble map (he adds that it was inspired by another fun project called "zipdecode," available here). The initial black-and-white version is below; click through to Eager Eyes and see the full color results.