It's always enlightening when someone manages to explain a somewhat complicated subject in terms of an abstraction that the audience understands. This is a grea

It's always enlightening when someone manages to explain a somewhat complicated subject in terms of an abstraction that the audience understands. This is a great example of that. And it works the other way too. When you've read this article and understood it you wil know how to explain graph theory to an accountant - "see it's actually not that hard, it's just like bookkeeping"