Even drawing the same Rune, differences in the method of writing it and the
environment could greatly change the effect and strength of the output.
Touko herself had once used that same Rune in a certain park, stealing the attribute of
Night itself from a particular place. Compared to what she had just done, her present
magecraft seemed hopelessly sloppy. Magecraft itself was tenacity. The transforming of
oneself into a single cog of that machine was the precondition to practice. As polished
as her craft may have been after years at the Clock Tower, any number of her old
friends would no doubt sigh in disappointment at that application of it, if they had been
alive.
Even so, for now it was sufficient.

The Case Files of Lord El-Melloi II, Volume 3, Chapter 2, Part 3