Infosthetics points to a page on treemap like representations which use circles rather than squares (Kai Wetzel). I worked on something similar a while ago which I never quite saw to completion. The code is currently residing on a hard drive which I am trying to resurrect - once I've done that I'll try to follow up with some images. Seeing this work has inspired me to give it a second look.
Circle packing in general (an approach that I didn't take, but which appears to have been approximated in this project) is a fascinating topic for the geometrically inclined. One can get a glimpse of the aesthetic qualities of this mathematical space from an image search.
Grokker uses a similar visualization.
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