Chang says it's because "it's so difficult." Films are a combination of so many different arts, and after working in these media, one is inclined to want to "undertake that final challenge."
「因為它很難」，張作驥分析，電影是所有藝術的綜合，駕馭過這個媒體後，會有通過「最後一道關卡」挑戰的感覺。