In the realm of letters, a real transformation scene, rendered credible to the higher fancy by its slow cumulative movement, is the tale of the change of the dying Rowena to the living triumphant Ligeia in Poe's story of that name.

Substitution is not the fairy-story.
It is transformation, transfiguration, that is the fairy-story, be it a divine or a diabolical change.

There is never more than one witch in a forest, one Siege Perilous at any Round Table.

But she is indeed a witch and the other is surely a Siege Perilous.
We might define Fairy Splendor as furniture transfigured, for without transfiguration there is no spiritual motion of any kind.

But the phrase "furniture-in-motion" serves a purpose.