It is because our footsteps are free and random, which just could not be repeated.It is not like the straight lines or right angles in the city that are designed by the draftsman with a ruler.

• 因为我们的足迹是自由的，不确定的，和无法重复的，而不像城市里的直线，直角，和在绘图员在他们的图板上用直尺规划的生活完全吻合。