Both transfigure a region in whose joyful chords dissonance as well as the terrible image of world fade delightfully away.
The self of the self within knows it is in for a disaster and attempts to transfigure the dream into a new accolade of something.
Harry can summon his Firebolt when he battles the Hungarian Horntail, but he can't transfigure a rock into a flying broom (as Cedric transfigured a rock into a dog).
