And for some reason printers seem to be the place where the spirits are strongest

I actually had a concept for a fantasy world, where magicians craft spells much the same way software devs do. So you make your spell and publish it to the ether, and then anyone can invoke it using the magic word (package name), assuming the have the right dependencies available (eye of newt or whatever). But spells might have bugs. So if you used eye of red newt while the spell smith built it with the expectation you had eye of blue newt you might get unintended consequences