You may remember the Internet Mapping Project 
That was all fun and neat and oh wow back in 1998. The project continues to this day but the maps have so much information on them now that they look not unlike a big sponge-blob-thing.
Today I stumbled upon a recent article about Infosthetics, where graphical representation of data is purpose-built to match the type of data involved.
Scientific Papers and their interrelated citations of each other :

Words in a collection of poems and their relations based on letter-to-number frequency values and order of sequence in each poem. :

Check out the article for more examples and an interview with the author of the Infosthetics Blog for more info on this nifty subject.
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