It is evidence that supports the theory that what we call "Ghosts" are not "spirits of the dead", but could be Living people we are simply seeing through a time anomaly like a natural, sporadic "Einstein Rosen Bridge" that crops up and connects TWO different TIMES. From our 3D perspective it would be a local spherical area where within its bounds it would be a different time within or superimposed upon our own and vice versa.------Of course, any person from that other time would likely be called "a ghost" to us and be wearing clothing and have other inanimate props, like eyeglasses, canes, weapons etc. It would even explain INANIMATE "ghosts" like "ghost cars" "Ghost Trains", etc. This theory is better than the superstitious "Spirit theory" on many counts.
1) it is supported by Science Einstein and Rosen, the greatest minds of the last century said it could happen.
2) there is no need to invent 'mystical entities", such as ghosts and spirits, as what we are seeing are Living people, just in another time.
3) it explains "inanimate ghosts" non living things like trains or ships, or clothing as simply being part of the other time.
4) It looks exactly what the "ghosts" of legend and superstition look like---and are most likely the same thing only attributed to being "spirits" by superstitious people who saw them before PHYSICS itself hadn't been invented yet.
Indeed the study of such phenomena not only would verify Einstein's theory in the real world, and explain "ghosts", but it would also give us insights into possible time travel technology in the future.---if we can figure out how it works. There is NO "Supernatural" only the Natural that we haven't figured out yet