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His signature play "American Buffalo" (勾心鬥角), first staged in 1986, became known as a theatrical milestone of Hong Kong as written up by "Film Bi-weekly" (電影雙周). Ho Yi's unique and original treatment in the delivery of the rich David Mamet dialogue in Cantonese (Cantonese is now officially recognised as a language) created a new form of acting style known as Wu Li Tou (無里頭) for the Hong Kong stage.