This is doing the rounds today, and it’s superb:
A day on the London Underground from Will Gallia on Vimeo.
Will Gallia has created an animation of Tube journeys extracted from TfL Oyster data and turned it into an animation showing journeys over the course of a day.
“This project was started in 2012, but wasn’t finished until 2015. The idea was to visualise real London Underground data on the Tube map was we know it. I wanted to write all of the movement in a shader. Initially I thought I would have each journey (or person) as one pixel in the final animation, using a GLSL pixel shader to move the pixel.”