Diagram: Thousands of passengers of the Moscow Metro
The diagram shows how many thousands of passengers get in and out of Moscow metro stations every day
Diagram
The larger the circle, the more thousands of people pass through the station per day.
Transport hubs with common entrances are connected into a single circle.
Script
The data in the diagram "Thousands of passengers of the Moscow Metro" is generated by a script in Illustrator.
Here's a slow-motion video of the generation process: