This is a Processing.js implementation of one of Edward Tufte's graphics, as demonstrated earlier by one of my favourite datavis blogs &em; Juice Analytics.
The graphics below is not from an image file. The graphics is drawn on to a canvas element.
Note: View source of this page to see the javascript+processingjs code which renders the graphics.
Currently, only Firefox 3.0 beta editions and latest webkit enabled browsers can render this graphic.

Screenshot, in case your browser is not rendering this correctly