As Butler explains: “Visualizing data is like photography. Instead of starting with a blank canvas, you manipulate the lens used to present the data from a certain angle. (…) What really struck me, though, was knowing that the lines didn’t represent coasts or rivers or political borders, but real human relationships. Each line might represent a friendship made while travelling, a family member abroad, or an old college friend pulled away by the various forces of life.”
While these are visually interesting, they tend to have a much stronger effect on a personal level since the user draws connections between unique patterns in the poster and correlating events in their life.