Showing now versus then? Consider using a comet chart

Will the Comet chart replace Gap charts in Steve’s practice? In discussing this with Andy Cotgreave they both agreed that you couldn’t use a Comet to compare purely categorical items; for example, the percentage of people that prefer Coca Cola to Pepsi, because there is something diminutive about the tail of the comet.

Showing now versus then? Consider a Comet chart - Data Revelations