A theory is a theory : this is refutable and argumented. But nobody knows if its real or false. It depends of the evidences, but also of the beliefs....

What if we were living in many spacial plans ? What if the "ghosts" of our world were the deaths living peacefully in an other plan ? What if we were the ghosts of their word ? What if we were all dead, us in their world, and them in ours ? What if when we think of dealing with a paranormal event, we were dealing with a banal event, a current event in this other universe, in this other plan ? A woman which bring down a plate and we think this is a ghost. Fear. A chat is walking as usual among the grass ans we thing this is an elf... 

What if... we were not alone because there is not simply one only life plan, but a lot of in simultaneously. What if ...