A new visualization of the Stanford Encyclopedia of Philosophy (SEP) displays the connections between each article and the “related entries” listed at the end of it.
From a distance it’s a bit hard to read:
But once you zoom in…
and then zoom in some more…
…you can start to see the connections.
And when you click on one of the nodes, all but it and its connected entries fade. Here is a detail from the map for “consciousness”:
You can explore the map yourself here.
Dr. Boudourides describes the project and what can be learned from it here.