@Theaetetus,
that is a phenomenal find! thanks! When I was first started to write school papers, I used a method called "spider outline" which basically had the topic in the middle, the topic which branched out from them, and the subtopics that branched out from those. This looks just like that method. This functions as a perfect thesaurus. Also, it reminds me of spartan models for organic chemistry.
Still, great find!