Now, if anyone in the neighborhood asks me, "Why is your house blurred?" I reply, "Why are you asking? Is anyone asking questions about me? What did they look like?" (well, that's what I plan on replying if anyone asks)
Zillow publishes, right now, interior shots of my house -- put up years ago for a sale listing. I have claimed the place as mine, but Zillow won't let me take them down.
Zillow allowed inserting new photos in the list, so I did: dozens of big wildlife photos. Considered a raging fire scene, or maybe a crack den, but then of course I might some day want to sell ...
The second key feature is that the inmate can't observe the guards. He can't know who they are and can't even know if they're paying attention to him or not.