Press green flag, click on a number of points, then press Space. Use turbo mode. The program divides the grid into areas closest to a given point and paints each with a single colour.
If fiddling with the project: "roughness" changes pen size. At 1, it looks optimal, but really slow. "power" changes the way distance is calculated. "2" is our ordinary distance. Setting it to 1, 2, or a really high number will produce straight lines, othewise, you can get slight curves (which I think is neater).
