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Take a look at this video for feeling the flow of bus passengers in the city of Porto. The video was made with a new edge bundling algorithm that I have proposed. Implemented in Processing 2.
More details, link to the article, source code, and online app for making your own bundles (powered by processing.js) may be found in the video descrition at Vimeo and at GitHub.
Would love to have feedback from you guys! Thanks!