Which story does the idiom' pointing fingers at mulberry trees' come from?

of all these housekeepers in our family, which one is easy to pester? If you make a mistake, they will joke, and if you make a mistake, they will complain. (Qing Cao Xueqin's Sixteenth Story of A Dream of Red Mansions

The idiom "pointing at mulberry and cursing at trees" is often used. Originally, it was a metaphor for exposing nails and secretly cursing B, that is, pointing to Zhang San cursing Li Si. Someone wants to ask, does this have anything to do with mulberry and Sophora japonica? In fact, the two trees "Mulberry" and "Sophora japonica" are really blamed for thousands of years, which has nothing to do with them at all.

Idioms with similar meanings to "pointing at mulberry and cursing at tree" include: pointing at mulberry and cursing at tree, pointing at east and west, pointing at pig and cursing at dog, pointing at rooster and cursing at dog, and catching chicken and saying that dog. They are all common usages and have similar structures. It may be because things like mulberry, things, pigs and dogs, chickens and dogs are closely related to people's daily lives, so people naturally use these words when expressing the meaning of referring to this and that, in order to achieve vivid and vivid results.

"pointing at mulberry and cursing at Huai" is also one of the strategies in the art book "Thirty-six Strategies". The original intention refers to the strategy of indirectly admonishing subordinates to make them obey. This plan is also extended to the use of various political and diplomatic strategies, "pointing at mulberry" and "cursing", exerting public pressure on opponents to cooperate with military operations.