Zhao Gao pointed to the deer and said, It's a horse. Metaphor deliberately turns black and white and confuses right and wrong. From Historical Records of the First Qin Emperor: "Zhao Gao wanted to make waves, but he was afraid that his ministers would not listen. He first set up a checkpoint and offered a deer in the second place, saying,' Ma Ye.' II smiled and said,' Is the Prime Minister wrong? Call a deer a horse. Left ask right ask, left ask right ask, or silence, or say Ma Yishun Zhao Gao. "