A map needs a key and a scale to make it easy for people to understand. A pie chart is a good way to show information clearly. It shows a total number as a circle and the circle is divided into ...

A pie chart, a map and a giant mural... all with a deeper message. London's geekiest mural? It features a map superimposed on a pie chart so, yes, it has to be a contender. But there's a bit more ...