The images linked below are two more examples of the material I’m generating for my dissertation. The first is a visualization of the authors and literary references (in proper noun form) made by New York Times reviewers of Pynchon’s books. The second image is the same, only drawn from Amazon customer reviews of Pynchon’s books. Comparing the two, you can see how different sorts of cultural reference (and different levels of density of reference) exist in the sets of text.
Both images were created using the wonderful web gizmo Wordle, which allows users to upload their own data and create custom visualizations.