Kudos to Prof. Christopher Andrews at Middlebury College, who is teaching CS 465 - Information Visualization this semester. When his lecture slides introduce the topic of graph visualization, the first question posed is "What do nodes look like?" (Slide 15). And that is exactly right; it should no longer be an unquestioned assumption that "nodes are points". The representation, in particular the underlying dimensionality, of the nodes is an explicit, essential choice that must be made when deciding how to visualize a graph. That's the first time I've seen this point made in a set of undergraduate lecture slides. Well done!
