I believe the possibility exists of states of existence and / or other ‘explanations’ to phenomena that we have yet to experience or have the appropriate level of understanding/sophistication or even instrumentation to ‘measure’ such things.
IE: we can only truly ‘see’ so many colors [ROYGBIV, but not ultra, infra-etc]- but we do see rainbows. Dogs have a more limited visual sensory range and cannot even see rainbows at the level we see them.
Other things can and probably DO exist that go beyond our current biological, physical, technological or even comprehensive capacities… therefore- a ‘ghost’ may exist, but as a manifestation of something we are not yet capable of ‘peering’ into .. (higher level of vibration, as in the color example..etc)
-=( Cross-posted to/from InZenity )=-