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Grokker, or Visual Navigation (19 Jan 2004)
The visual metaphor that Grokker uses is circular and recursive. The search space is presented as a circle that occupies the maximum area that its window has. The search results are grouped into categories that Grokker derives automatically from the results. Each main category appears then as a circle itself within the larger one.
Article URL: http://www.infovis.net/printMag.php?num=138&lang=2

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