Comment by KMag

> Build better walls. Don't try to outlaw people "looking at you", no matter what frequency they use.

It's just not possible to make a wall that can't be seen through, at least without making them tens of meters thick, even using high density concrete, tungsten, or uranium.

Muons aren't photons, but cosmic muon tomography has been used to image the Great Pyramid of Giza and also several mountains. Exposure times for cosmic muon tomography are very long, but with enough exposure time, correlating 5-minute blocks across days, someone could work out mean density throughout your house and make low-res 3D video of your daily routine, even with 1 meter thick walls of reactor-grade high-density concrete with sheet steel cladding.