" As her tutors had said, there were two signs of a good alchemist: the Athletic and the Intellectual. A good alchemist of the first sort was someone who could leap over the bench and be on the far side of a safely thick wall in three seconds, and a good alchemist of the second sort was someone who knew exactly when to do this. "

― Terry Pratchett , Feet of Clay (Discworld, #19; City Watch, #3)