Hit the letter z, or click the word zoom to enable or disable zooming. Hold down shift while typing a number to replace the previous number (U.S. keyboards only).
This project began a very short sketch (a few hours) that I created because I was curious about how the numbering works for postal codes in the states.
A detailed description of this project (and source code for an updated version) can be found in my book Visualizing Data.
Last updated 28 September 2004... This version adds several features over the original, including zoom, some new colors (thanks to Eugene Kuo), and a better zip code database (because of all the people who emailed and were sad that they couldn't find themselves).
Built with Processing.