The homepage of Chang's University of Pittsburgh website sports a picture of his five-year-old grandson wearing a Superman outfit and impish demeanor. Chang's written instructions tell us to click on the image of his progeny to reveal his, Chang's, true identity: none other than sagacious Master Yoda of Star Wars fame. Obviously, Chang Shi-kuo hasn't lost his youthful playfulness.
進入張系國架設在匹茲堡大學的個人網站，首頁是他五歲外孫穿著超人裝的頑皮模樣，張系國俏皮的寫著：從小孫子的照片點閱進去，可以發現張系國的本尊──原來是科幻電影《星際大戰》中智慧大師猶達的模樣，流露出他赤子的一面。