It is hard to prove or dismiss existent of the world beyond. Many individuals and cultures have developed different ideas of the existence of afterlife, and each presents a different pictures.
Some cultures implies an existence of heaven and hell, in which people will be put depending to their actions from the past. Others suggest theory of reincarnation, in which the spirit is being reborn in its new body; commonly an animal body.
Each explanation is somewhat different, and we can't state which one is the true one. In fact, we can't state if any of them is true in the first place.
I'm not trying to say that none of these theories aren't plausible. I'm also not trying to say that "if it can't be scientifically explained, it must be supernatural/paranormal/a God's sign." What I'm trying to say is that there is still a lot of unanswered questions. True, all the questions we face may have a logical answer, but until we'll find them out, we all will be left in speculations and uncertainity.
But this isn't a bad thing in itself. After all, this is why we are asking quertions in the first place: to seek the answers.
I have to admit, I'm not a religious person by any mean, since - and I'll be as kind as I can - I don't feel like this is my cup of tea. However, I do believe that there may be an existence of something beyond what we can perceive.
In fact, there was conducted an experiment if some sort, which made me think deaply about the outside world.
In the early 1900's, Thomas Lynn Bradford have conducted an experiment, to prove his theory of an existence of afterlife. To do this, he've started an advertisement in newspapers in the search of 'spiritual accomplience'; as he believed that he could communicate with the living being after the death, if two spirits would coordinate perfectly. The second spirit in this experiment was Ruth Donar, who contacted Bradford after reading the advert, agreed to participate in this experiment.
After many meeting with Ms. Donar, Bradford came to conclusion that the most logical and efficient way to prove his theory would be commiting a suicide; which he - unfortunately for him - have commited at February 6th 1921, with a promise of returning with information about afterlive.
A week after his death, Ms. Donar claimed that she've contacted with the ghost of Thomas Bradford. This is what he had to say:
"I am the professor who speaks to you from the beyond. I have broken through the veil.
I had woke up and at first did not realize that I had passed. I find no great change apparent. I expected things to be much different. They are not. Human forms are retained in outline, but not the physical.
I have not traveled far, I am still much in the darkness. I see many persons, they appear natural.
There is a lightness of responsibility here unlike in life. One feels full of rapture and happiness."
As I said previously, it is difficult to state how true these words, and the experiment are. Many have claimed that Ms. Donor could lie about the witness of the ghost, but we can't prove or dismiss it as well.
I don't have much left to say to be honest. I may add up something else if I'll have, but for now I'll just leave what I wrote here...