Learning to Data

Also known as a Marimekko diagram, the mosaic plot lets you compare multiple qualitative variables at once. They can be useful, sometimes.

Using color as the visual encoding, show changes over time in two dimensions.

With latitude and longitude coordinates, there are a number of ways to map geographic data using D3.js and Leaflet.

A combination of a bivariate area chart, animation, and a population pyramid, with a sprinkling of detail and annotation.

Also known as ridgeline plots, the method overlaps time series for a 3-D-ish view of the data. While perhaps not the most visually efficient, the allure is undeniable.