Shielding is material which protects an area from electric or magnetic fields.

Some people shield spaces to prevent advanced hacking.  Others feel weapons or surveillance systems are targeting them.  Others feel something is communicating with their body or brain.

There are three primary ways in which things can reach or affect your safe space.  One or all of these may be affecting you:

* Electric fields and high-frequency electromagnetic radiation, common forms include light and microwaves

* Magnetic fields and low-frequency electromagnetic radiation, a common form is AC power

* Physical vibrations, common forms are sound, ultrasound, projectiles, earthquakes

To learn more, pursue classes in physics, electronics engineering, and electromagnetic compatibility.

Most information is transmitted by electric fields and high-frequency electromagnetic radiation nowadays.  It is blocked by covering an area in continuous conductive material, with no holes or gaps of any sort, not even seams.