Just after I moved in to my current house, I was putting up a conventional washing line when I was rudely interrupted by my next door neighbour who I hadn't even met yet.
Her ONLY window that overlooked my clothes line was her bathroom window, which was frosted. But she opened this window, leaned out and said "The previous owners just used a rotary line, which they had at the other side of the house, so I could not see it".
As I said, she could not see it from any window in her house unless she opened the bathroom frosted window and leaned out!!!
From then on, my wife and I called her Hyacinth Bucket (not to her face of course) and she did everything she could to annoy us. My house had been empty for a year, and I think she had got used to and enjoyed no-one living next to her.