iconoclast
n. 攻击传统观念的人; <史>反对崇拜圣像者
If you describe someone as an iconoclast, you mean that they often criticize beliefs and things that are generally accepted by society.
Cage was an iconoclast. He refused to be bound by western musical traditions of harmony and structure.
凯奇是个反传统的人。他拒绝接受西方有关和声和结构的音乐传统的束缚。
1. someone who tries to destroy traditional ideas or institutions