Fran De Aquino suggested VLF currents would trigger a mass shift in high mu metal. But my question is how is a magnetic field actually blocked in high permeability metal?
Magnetic forces aren't "blocked" in high permeability metal, rather redirected through it. Mu metal in particular, is made up of a combination of nickel, iron, molybdenum, and various other assortments. These combinations, along with a process called annealing, make for a very permeable metal that allows the magnetic field lines able to pass through the mu metal easier than open air. As with most things in nature, the path of least resistance is always the chosen path. Hope that helps.