We have discussed optics and acoustics of ghostly manifestations (see Physics of ghosts 101: The introduction and Physics of ghosts 101: part I – Optics, part II and part III- Optics and acoustics), but what can I say about a ghost, which appears with smell of a rotten flesh? How did that one conjure molecules of ptomaine so the witness could actually smell it? I admit, I have no slightest ideal However, there are some possibilities.
I was reading English translation of Michael Psellus, Dialogue on Operation of Demons . In the past I have explored the subject pretty much on my own (see Indian Gift, Visitations and especially Down the Sea Sallow), and now I’ve turned to experts. So I am reading Psellus, Byzantine scholar of XI century, and then in a footnote I am running into: “autopsy, i.e. intuition”. And I go: “What? Autopsy means intuition?”
The rhythmic pounding off in the distance sharpened and intensified as well– became a work beat for some army of troll-like underground laborers, performing some endless, brutally monotonous task, wrote Dr. Eben Alexander in Proof of Heaven, a book about his near death experience.  I can't tell that for sure, but I think this was a music from Hell, and I’ve heard it too.