The Non physical world for the vast majority of physical beings is an unseen, unheard, dimension.   The 3d senses are as such that they operate for use in a 3d world.  The lens of a basic camera is designed to reproduce 2d images…one views the picture 2 dimensionally but the awareness tells the person that there is actually a 3rd dimension…one cannot see it from the camera picture, but one knows that it is there.  This is the same with the Non Physical world/dimension…one may not be able to see it but one knows it is there…if they have that awareness.  It resonates on frequency levels that the 3d senses cannot process…Imagine a top spinning in front of you..it spins faster and faster and faster till eventually it spins out of vision…the brain cannot process the speed so that the eyes can see it…but it is still there occupying that same spot but spinning so fast it is unseen.  Its frequency level is out of the 3d range of sight.  Imagine a tape recorder playing a voice…speed it up faster and faster and faster it becomes a high pitched whistle till eventually it goes out of the range of the human hearing…dogs can hear whistles that humans cannot…the human hearing cannot process that spectrum or pitch of sound…some mediums will attest to hearing high pitched whistles that seem to flash by…they are picking up those high frequency sounds that come from the voices on the other sound…but the 3d hearing cannot process it.  Within the mind are the internal senses…they are not governed by the limitations of the external 3d senses…the internal senses operate during dream time …or when a medium switches into that alternative part of the mind�?that alternated consciousness�? and uses the internal senses that are able to process the higher frequency signals and change them into the sight and the sounds etc�?the mediums mind shifts into a higher gear and is able to process from an internal aspect that which is beyond their 3d range…they ‘see�?they ‘hear�?with the mind…they see and hear that which maybe unseen or unheard by another person.  There maybe two people in a room…one may see and hear a Non physical (spirit) with their minds eye their minds ear...whereas the other person may not…the one that can has shifted or quickened the internal senses to match those frequency levels…sometimes this is involuntary they see or hear etc haphazardly…and it is only a matter of learning how to control and switch on and off or ‘tune in�?whenever needed�?When a medium looks at something solid and switches into alternated consciouness…that which is solid may look fluid as the medium sees the molecules shifting and moving …The energy molecules of the Non physical world are less dense than the 3d world…that is why some Non Physicals appear as transparent and less solid…more fluid to the internal eye…the sound also is sometimes distorted and may sound hollow…The energy molecules of a Non Physical can pass through the solid matter of the physical world due to the resonating and speed of their molecules…in the dream state a physical being can pass through matter…for the mind is not bound by the 3d law of physics�?the Non Physical being is thought creative mind energy that exists on an alternative plane of realism that is not bound by the 3d law of physics.