Gao Brothers work tend to be charged with political and social nuances, including their recurring use of Mao's image. Gao Zhen, the elder of the brothers, explained through an interpreter that "1968 was a crucial moment in the Cultural revolution, where political 'cleaning' took place. Our father, a simple laborer was thrown into jail. We still don’t know if he actually committed suicide as the authorities told us or if he was killed during his incarceration"