Charlie ParkAfter you read this post, you’ll probably want to check out the follow-up, A Slopegraph Update. Back in 2004, Edward Tufte defined and developed the concept of a sparkline. (Small, word-sized charts, embedded in text or other data.) Odds are good that — if you’re reading this — you’re familiar with them and how popular they’ve become. What’s interesting is that over 20 years before sparklines came
