[Start here](http://blockbuilder.org/enjalot/0d87f32a1ccb9a720d29ba74142ba365) [<img src="https://gist.github.com/enjalot/0d87f32a1ccb9a720d29ba74142ba365/raw/2e9586047fabede657045ea1836e20d827bb6166/thumbnail.png">](http://blockbuilder.org/enjalot/0d87f32a1ccb9a720d29ba74142ba365) Notice the difference in the way we get a projection function, we get a real d3 projection. Try using it to render a path like the [Tube routes](http://enjalot.github.io/wwsd/data/UK/london_tube.topojson). Resources: [Dots on a map: mapbox-gl video](https://www.youtube.com/watch?v=lyuaE5jAC68&list=PLI_sHchSmdCDH0ooOKSWSA1uzr1vCqgHh&index=5)