Every transaction we make creates a shadow about ourselves. When we use the ATM, we leave a small piece or ourselves behind in the means of a time stamp, a withdrawal in a database, a location. As capture and storage costs asymptotically approach zero, it is easier to just keep everything rather than selectively choose what to trash. The more we do in this electronic world, the larger and darker our shadow becomes and the more potential for data leakage and problems arising.