Thanks. This is all client-side code, which was my entire goal. The visualization itself is built with the InfoVis toolkit (which I'm not sure is being maintain

Thanks. This is all client-side code, which was my entire goal. The visualization itself is built with the InfoVis toolkit (which I'm not sure is being maintained any longer.) If I were to do this today I'd look at D3 probably. The Wikipedia API is nice. It just requests an article by name and parses the result trying to get the first link. Getting that link can be a bit tricky though since there can be all sorts of metadata that needs to b ignored. Luckily Wikipedia seems to stick with some standard patterns. So basically it just recursively follows links until it either hit Philosophy or one that it has encountered before, in which case a branch is made.