The Japanese Friendship gardens pathway had curves as well as strait lines. The linear winding pathways created a pattern that I demonstrated as the figure. The ground is anything else, even if it was the same material (dirt).
Getting closer to the pathways more detail and patterns of the plants growing over the path became more visible. The curved lines are still apparent.
When closely viewed, the pathway becomes more strait and more precise. There are less plants (ground) overlapping the area.