In the Shinjuku city hall many years ago there was an animation showing how population desitiy changes in Tokyo during one day. It was absolutely mindblowing, but I have never been able to find it online.

If someone happens to know where I can find this animation I would be really grateful.

Thanks for sharing this! It will definitely be helpful, as I am considering updating my map to use WebGL.

Wow, it even includes weather (rain) and airplanes.