Ronald & Philip, along with their good friend, Susan, performed experiments with the paranormal, to establish any kind of substance to it.  What they discovered was both startling and tangible.  Their investigations were performed with caution and integrity, dismissing the hogwash and stigma associated with it.  Susan is an excellent artist herself, having been documented in the twins' books throughout and during the years of their interest.  Something is here with us.  However, what exactly it is still rages on today.  No adequate answer is available at this time and no one can claim to have one, as of yet.