Artists have to practice shrinking and enlarging circular designs by hand, as well as developing their creativity and artistic abilities. They also have to constantly hone all of their skills.
但並非人人吃得起這行飯，他們得練習徒手畫出放大、縮小、等比例的圓形圖案，及創意的開發和創作能力訓練等，每個環節都得不斷地揣摩、熟練。