I wanted to see and know more, the report did not give enough details, and the image was too small to see the real beauty. So I chased down (hunting in the Boscogoogle) Chris Harrison's homepage. He gives more info, and much bigger images. There you can see the full beauty of this visualisation, and catch a glimpse of how the Bible functions as a canonical meaning machine. As I read the rather vague description the "cross references" are not diachronic allusions or quotations, but rather the sort of connection real readers synchronically make (see the discussions of "intertextuality" in the bibliablogsphere captured in the Carnival or start here Intertextuality: Part 3 and work back).

Beautiful!