This visualization illustrates the use of a chord diagram. It's based on Mike Bostock's visualization of Uber data, and makes use of data made available by Divvy here.
This shows the origins and destinations of Divvy bikeshare trips in Hyde Park. The arcs represent origins and destinations, and the chords represent trips. Hover over the arcs to see what Divvy stations they represent. Hover over the chords to see magnitude in each direction.
4/18/2017 - the following links are dead
A larger version of this visualization is here.
I created this visualization as an example in my D3 workshop.