This will be useful for quickly scanning the graphic and understanding what the most common categories are. It can be hard to visually interpret which categories are most common by looking at all the nodes and finding the most common color.
A similar example is the aster plot that was created during codefest by @parkerabercrombie and @bbest:
http://bl.ocks.org/bbest/2de0e25d4840c68f2db1
This will be useful for quickly scanning the graphic and understanding what the most common categories are. It can be hard to visually interpret which categories are most common by looking at all the nodes and finding the most common color.
A similar example is the aster plot that was created during codefest by @parkerabercrombie and @bbest:
http://bl.ocks.org/bbest/2de0e25d4840c68f2db1