 The university's name is a pun on the Invisible College, and many aspects of the University are references to Oxford and Cambridge University.The exploits of the head wizards of the Unseen University are one of the main plot threads in the long-running fantasy series, and have played a central role in 13 novels to date, as well as the four supplementary "Science of Discworld" novels and the short story, "A Collegiate Casting-Out of Devilish Devices".The official motto of Unseen University is "Nunc Id Vides, Nunc Ne Vides", loosely translated as "Now you see it, now you don't".