1. A data visualization method comprising: accessing a plurality of initial documents at a first moment in time; first processing the initial documents providing processed initial documents; first identifying a plurality of first associations of the initial documents using the processed initial documents; generating a first visualization depicting the first associations; accessing a plurality of additional documents at a second moment in time after the first moment in time; second processing the additional documents providing processed additional documents; second identifying a plurality of second associations of the additional documents and at least some of the initial documents, wherein the second identifying comprises identifying using the processed initial documents and the processed additional documents; and generating a second visualization depicting the second associations.