When asked what glaze would satisfy him, Tsai looks out a window at a leaf that has been washed by spring rains, its color gradually changing in brightness with the movements brought on by the wind, and he looks at the sunlight shining through the diagonally falling rain to become a rainbow. Opening the window he says, "Nature is my favorite glaze!"
問起什麼樣的釉色他才滿意？蔡曉芳望向窗外，被春雨洗過的綠葉，隨風搖曳影動的漸層光影，斜斜雨絲被輕輕灑落的陽光幻化成七彩虹，蔡曉芳推開窗戶說道：「大自然是我最喜歡的釉色！」