Let’s start with a definition (for readers of yesterday’s post, not usually the best way to start):
Transmogrify
verb (transitive)
To change in appearance or form, especially strangely or grotesquely; transform
For writing students (or maybe only to students of a certain Professor Randy Nelson at Davidson College) a transmogrification is also a writing exercise where you take a piece of writing, maybe a poem or a newspaper clipping or some song lyrics, and rewrite it in a completely different and unexpected form.