This is the new and improved version of the familiar map can teach regions (formal, functional, vernacular) as well as the importance on TV markets as a diffusion mechanism for culture. As mentioned by Andy Baker, "This map is also useful for showcasing 'threshold' and 'range' from 'Central Place Theory.' For instance, I ask my students, 'Why are the Mid-Atlantic & California coasts boundaries (range) so small compared to Great Plains teams?'" Great idea Andy!
Via Seth Dixon, Michael Miller, Mike Busarello's Digital Storybooks