not stalking just observing

I can stare out of my thin slice of a window down into the life of another. I can see down onto their patio and in through their large double-paned sliding glass doors that are never shut with the curtains that drape their edges. I can see what is playing on the television and I can see what is hung out to dry. I can tell when they get home and I can tell when they go to bed. If they smoke, I can watch. If they play cards, I can see their hand. If they stand outside at the edge and look down at the people passing below them, I can stand looking down at them.
It makes me wonder if there is a window into my life that someone can silently look in through, without me having the slightest clue.