Now and then, I've seen people use the term 'Illusionism', used for describing a kind of railroad, such as in this answer and elsewhere. I'd like to learn the origin of Illusionism, both in the sense of when/where/under what circumstances people started consistently using the term in RPGs, and in the sense of when/why/under what circumstances the phenomenon became widespread enough to be known and recognisable.
I've seen people point vaguely in the direction of the World of Darkness fandom and/or books as the natural habitat of the phenomenon in question. Is that where it originated? Was it part of some Storyteller advice, a common advice among some renowned GMs, both or neither?