Looks like they illustrate the dual nature of how line intersections in the grid map to equilateral polygons in the tiles. It wasn't obvious to me until I read

Looks like they illustrate the dual nature of how line intersections in the grid map to equilateral polygons in the tiles. It wasn't obvious to me until I read the "how it works" section. https://github.com/aatishb/patterncollider#how-it-works https://github.com/aatishb/patterncollider#how-it-works