There’s a lot of news & commentary about US congressional gerrymandering, with arguments back and forth about its cause and effect, which have led me to no certain conclusion. This one graphic cuts through all that with what looks like a definitive answer, simply understood and convincing.
It’s done with a sequence of three graphics, each of a different type suited to what is being conveyed, with a one-sentence explanation accompanying each.
http://www.nytimes.com/interactive/2013/02/03/sunday-review/imbalance-of-power.html