Visualization tool that explains how a large sum of money like a billion is spent. A great example on how visualization can provide an explanation on a topic that otherwise is hard to grasp. From Information is Beautiful:
This image arose out of a frustration with the reporting of billion dollar amounts in the media. That is, they’re reported as self-evident facts, when, in fact, they’re mind-boggling and near incomprehensible without context. But they can start to be understood visually and relatively, IMHO.