The tour guides teach the children that before you paint a portrait, you must first find that person's "magic line," just as when looking at a tree one first takes in the trunk, and then works one's way out to the branches and twigs.
導覽人員引導孩子發現，畫人之前要先找到人的「神秘線」，就像看一棵大樹，要先掌握樹幹，再注意分岔的小枝枒。