What we know about vibration is only what we perceive through man-made instruments; what is moving beyond this we do not recognize as vibration. But as there is no other word this is the only one we can use for it, for it is the same force which sets everything in motion on the physical plane, and this continues on all the other planes of existence, setting them all in motion. It also explains to us that it is vibration, a certain degree of vibration, which brings to the earth the things of the inner world, the world that is perceived though not seen; and a change of vibrations takes away the things that are seen into the unseen world.