recasting.
The answer is obvious: Don't screw up when casting any spells created by this wizard.
You also, in a different tome, find a spell to identify different flavours of magic so you can tell who cast spells or if there are from the same phenomenon.
And now that that diversion is over and done, you return to your interrupted task. You were a bit leery of casting that anthropomorphizing spell... but considering how big your centauric form is, and how closely spaced the shelves are, it's a practical necessity. And this time, reading from the spellbook itself, the spell goes off without a hitch; practice is making perfect, it seems.
Written by Catprog & Cubist on 10 October 2010