If Ying Zheng was asked to describe Li Si's heart, it might be difficult for him to say it.
Because that's what he actually saw,
Sir's heart.
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The inspiration came from looking up the idiom "Ming (Qin) mirror hangs high" in the dictionary while doing homework that day.
Ge Hong's "Xijing Miscellaneous Notes" records that Qin Shihuang had a mirror that could reflect the good and evil in people's hearts (I think it might be the King of Qin's Bone Mirror?).
Purpose: Zhengsi 99