Connected Scatterplot
▻http://steveharoz.com/research/connected_scatterplot
As far back as the 1790s, the connected scatterplot was used to visualize the cycle of a steam piston. Economists have since used it to depict data about unemployment and job openings over time.
Recently, journalists have begun using the technique to convey information to readers. But how well do those readers understand this unfamiliar format?