The line-angle illusion
We fail to judge the distance between two lines on a chart.
Comparability
Hammock plots
Matthias Schonlau introduces the hammock plot.
Deliberately obstructing chart elements as a plot point
These "ridge plots" have become quite popular in recent times.
Election coverage prompts good graphics
Election coverage brings out the best of interactive graphics
Using disaggregation in dataviz
Disaggregating data can be very useful when making charts
Making colors and groups come alive
How to use color effectively in a dataviz