John Nelson made this map of only those electoral tracts that returned close to 50% Trump-Clinton votes in the USA. The nice idea, taken from Tim Wallace at NYT, is to show them as isolated islands in a sea of partisanship. John blogged in detail about how he did it, which is generous and a welcome inspiration for others.
Using metaphor to reinforce a dataviz message is an important tool. I decided to close my dataviz book, now in draft version 1, with examples of that. I went with Carbon Visuals, Gun Deaths 2013, 5W Infographics’ solar system exploration, and WP’s flight MH graphic.