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You can go to him and talk to him about it and ask him to put it in another place. After all, it's not good for people.
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You also put a mirror on the balcony in the same place and reflect it back in his house.
Looking at the distance, the distance basically has no effect. It's not like putting a mirror on the door inside the corridor, that's not okay. It has to be addressed. If the distance between the buildings is far enough, it will not matter.
Installing a mirror on the opposite side has no effect on your home, it is the problem of his family, and what a mirror can solve can decide. >>>More
Hello! Then install another mirror on the other side.
It doesn't matter, you can also hang a mirror facing the balcony opposite!
Find the opposite person to adjust, or buy a bigger mirror to do the opposite.