As I noted, I call it physics. There were several posts that seemed to put this into the category of a hoax or something wierd. The principle used is no different than what you might encounter in a discussion of electrical and magnetic fields in an engineering or physics class.

Why is this not mystical? - A mystic is someone who can communicate directly with God. Clearly that's not going on in the method I outlined - i.e, this isn't mystical, it is just an application of the principles of physics.