Spiritual successor of this is how many slap's it take's to cook a chicken. There was a viral video on this a few year's ago rather funny https://www.youtube.com/watch?v=LHFhnnTWMgI
This is interesting how are the shadows cast? Since it’s 2D, maybe there’s some invisible depth mapping that includes buildings. Then you could cast rays based on the sun’s position to generate the shadows. Maybe the depth data comes from an API. Either way, really cool visualization!