The people who do not want you to be able to see in should, as wow says, use curtains . Or maybe tinted or one-way silvered panes. I was amused when my sister-in-law got upset that I had no curtains in my bedroom. The nearest neighbor was almost a mile away. I needed more light than curtains would permit. I want to be able to see out well enough that I would invest in the one-way panes. I am glad that I need not submit to the tyranny of mean spirited neighbors.