Node color: represents whether thing was featured on frontpage (red) or not (blue).
Mouseover node: tooltip shows basic information, incoming links (i.e., from source things) are highlighted orange and outgoing links (i.e., to derived things) are highlighted green.
Pan/zoom: Use mousewheel (or two-finger scroll) to zoom, and click-and-drag to pan.
Click: click on a node to open the thing's page in a new window.
Many of the star subgraphs are due to the Thingiverse Customizer.
2013, Spiros Papadimitriou