MP is the art of controlling the minds of the audience thru the music you play and therefore it works best when it originates in your mind.

在脑子里弹奏“(MP)是一种通过音乐演奏控制听众思维的艺术，所以当MP源于你的大脑时它工作得最完美。”

youdao

But unlike a regular rainstorm, the water above your head stops as you move though it, allowing the audience to feel as though they are controlling the weather.

BBC: It is raining indoors in London