Sunburst and Cartograms in R by Ajay Ohri.
From the post:
There are still some graphs that cannot be yet made in R using a straightforward function or package.
One is sunburst (which is radial kind of treemap-that can be made in R). See diagrams below to see the difference. Note sunburst is visually similar to coxcomb (Nightangle) graphs. Coxcombs can also be manipulated and made- but I am yet to find a straight package to make coxcomb using a single function _histdata package in R comes close in terms on historical datasets.
The Treemap uses a rectangular, space-filling slice-and-dice technique to visualize objects in the different levels of a hierarchy. The area and color of each item corresponds to an attribute of the item as well.
The Sunburst technique is an alternative, space-filling visualization that uses a radial rather than a rectangular layout. An example Sunburst display is shown below. citation- http://www.cc.gatech.edu/gvu/ii/sunburst/
Maybe it is being graphically-challenged as they say but I really appreciate clever graphics.
I think you will find the graphs demonstrated here useful in a number of contexts.