The Doom of Men and the Ringwraiths

[The Saucepan Man]

Well, although they were non-corporeal creatures, I do not see this as necessarily preventing them having a presence in, and interacting with, the physical world. This, for example, is the common perception of ghosts and poltergeists. But I am straying further into the realms of speculation with each post, so I will have to get back to my books, and possibly try a search here, to see what evidence there might be concerning their state of existence.