While at Tokyo University of the Arts, he participated in a restoration project of a Meiji-era mural adorning the State Guesthouse. A Japanese teacher told him that it was important to mix the paints 200 times before application. Any less and the consistency of the paint would be uneven, causing it to crack and peel in the long term.
就讀東京藝大時，郭東榮參與日本「迎賓館」的明治時代壁畫修復工作，日本畫師告訴他，顏料必須攪拌 200 次，才能塗上去，如果少於 200 次，顏料質地會不均勻，經不起時間考驗，容易龜裂脫落。