Diversity topology

In cartography there's a concept called "topology", or in other words the math behind how objects are spatially related to each other.  Topology can be a rather complex field of mathematics.  Luckily people like Vi Hart and Nicky Case can do an excellent job of explaining it.

And they can go a step farther, by using the principles of topology to create an interactive website that illustrates the math behind the segregation of "slight" racism.