Unseen University (UU) is a school of wizardry in Terry Pratchett's fictional Discworld city of Ankh-Morpork, staffed by a faculty composed of mostly indolent and inept old wizards. The university's name is a pun on the real-world Invisible College. The University is centred around the 800-foot (240 m) Tower of Art, out of which it grew; any further attempt at grasping its geography is close to pointless.

Due to the high levels of background magic in the vicinity, a typical map of UU vaguely resembles an exploding chrysanthemum and is usually only valid for a day or so, though it is generally agreed that the inside of UU is larger than the exterior walls, under normal circumstances, should be able to contain. This is also the cause of the various physical and biological anomalies that plague it. In some rooms the direction of gravity moves around as a day passes, and some rooms contain other rooms which contain the room one started with (especially problematic for a conga line).

The University's gargoyles have taken on a life of their own (not that this is anything unusual for Discworld gargoyles in general). Both a colony of ants in the main university buildings and a flock of ravens roosting in the Tower of Art show unnatural intelligence and, for the ravens, an ability to speak, again, common for entities associated with the University. The fabric of the University is said to absorb knowledge, since all students enter university knowing absolutely everything, and leave admitting they know very little.

One of the most notable rooms in Unseen University is Room 3b. This room is not believed to exist, but a surprising number of classes are scheduled there. In fact, at times of great celebration in the city of Ankh-Morpork it is not uncommon for the entire faculty to be teaching there.

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