Visualizations are great for getting a grasp of data sets, but sometimes the data is too big for a certain visualization technique. Every type of visualization has limits for how much it can display while still being useful. These limits are not due to the visualization alone, they also come from the capabilities of our brains to perceive and interpret what our eyes see. Different visualization types rely on different capabilities of our visual system, so they each have different limits. Let’s look at a few examples.Pie Charts
Pie charts are among the most popular visualizations for percentage data, but they aren’t appropriate for more than seven categories. This is because our brains are not particularly good at telling different angles apart, and even worse at telling how far apart different angles are from each other.
If you have a pie chart with more than seven categories, consider turning it into... keep reading