Adrian, thank you for the explanation, that's great!
Ysb, yes, the viz can be a bit loaded (and yet still doesn't show enough -- when I get the chance I may add highlighting the full tree emanating from a node, rather than just the direct edges, and maybe add basic keyword search/highlighting, to make browsing easier).
Basically I did most of this while I was waiting for my SD2. Back then I spent quite a bit of time on Thingiverse, and I realized that I was frequently following "remix" hyperlinks, but it was getting kind of tedious, and I was getting lost following trails of remix hyperlinks. So, this graph is a birds eye view of that. (The other thing I was doing often is finding similar or related things though collections -- i.e., going from one thing to another thing not via a direct remix link, but via an indirect same-collection link -- maybe another viz sometime).
One clarification though: each graph you see is one connected component. When you first click on the link, you get the largest connected component, which consists of about 5% of the things on Thingiverse (or at least those I have in my data) -- which is pretty amazing if you think about it (more than 5% of things are somehow related to each other--sort of). You can choose a different connected component via the drop down on the right (e.g., try 12, 17, 13, 18, ..). (A connected component it what the term says, btw: a partition of the graph where every pair of nodes is connected by at least one path) The decision to show connected components separately was kind of arbitrary, I admit.
Edit: My favorite cluster among those I found is probably Colbert (has many red nodes, so easy to spot too -- probably Thingivere site editors are Colbert fans? 
, and the cross between the Stanford bunny and Colbert ("a godless killing machine") a particular favorite (should print one soon). Anyway..
who knows, going back a generation may be better more often than not...