Text Time-Lapse by Lev Manovich is a tool that shows the additions, deletions, and edits to a document as a time-lapse. Load a Word document or text files with version numbers, and you get an animation of text.
It is a lot like a generalized tool version of Ben Fry’s piece from 2009 that visualized the evolution of Charles Darwin’s On the Origin of Species.
Visualize This: The FlowingData Guide to Design, Visualization, and Statistics (2nd Edition)
