Not much, apparently – except annoying Edward Tufte. Although delivered sarcastically, the message is that a 2-D pie chart adds nothing over a table of percentages and is susceptible to optical delusions; distorting this poor representation of data to a 3-D perspective just adds distortion. I will concede that there are differing points of view, but I’ll take the numbers, thank you.
This graphical joke courtesy of Flowing Data, a site by Nathan Yau dedicated to data visualization using the R statistics package.
-ddw