It'd surely be something interesting for physics: Determining what ghosts are made of. If they can occupy the same space as ordinary matter at the same time, maybe it could also be possible to make a computer chip out of ghostmatter. Ghosts in photos generally are clothed, and sometimes still have jewelry and glasses, so even inorganic matter can be transmuted to ghostmatter.
That way, you could make electronics even smaller: One core and one ghostcore sharing the same space. If ghostmatter can pass through other ghostmatter without any kind of interference, numerous cores could occupy the same volume. Batteries could also work the same way. You could volume-stack several ghostbatteries together. Your phone could have a run-time of weeks between charges.
If the ghost-li-po battery ruptures, it would do so in ghostspace, and not harm anyone nearby.
There could be many potential applications that could come from understanding ghostmatter.
However, it seems that thus far, ghosts only exist in the minds of people, which is not normally a good place for studying particle physics.
something is real. Go to the Van Horn mansion in western NY. I saw "it" during the house tour before anyone told me the place was haunted as fuck. I didn't really believe in that stuff until I visited that house. The place turned out to be a famous haunted house, which I would not have gone to had I known; I wouldn't intentionally go find out if it is real or not.
I wonder if there are any good sources of infrasound there.
And the human mind has a habit of hallucinating. A lot of people do it every night when they sleep. Doing it while you're awake can take a bit more effort. Sometimes all it can take is someone saying "Damn, it's creepy as hell in here."