I don't know what to do

[BigV]

well, I didn't know that. I wonder if you're kidding.. I mean like the rear view mirror in your car. anyhow...

Having a somewhat definite sense of your own personal space isn't too much to ask. Especially if you're required by your employer to keep track of things, papers, whatever. If you're supposed to have a space, then having something like this intrudes on the space. It's legitimate to act to have the intrusion removed. It's not a common complaint, for example, a radio playing in the next cube would be more readily understood. I have had people ask me to stop doing something that intruded on their space. It's ok to ask. It's also ok to ask someone else to ask.

I wish you luck.