Well, even where I'm from, most people don't have experience with Transform. I've heard about them from other people - mostly back in my Materia classes - but I can't say I've actually held one myself. Still, that sounds a lot like how they work.

[His voice takes on the kind of tone that a teacher might use in a lesson, or someone quoting a lesson they learned.]

Materia is a form of crystalized mako, the energy that runs through the world. It can be used to manipulate nature, either physically or elementally, depending on the materia being used.

[His voice drops the sound of quoting, becoming something more conversational.]

Transform Materia specifically alters a person's or creature's physical state, changing their size or turning them into something else.