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Unseen University Was Much Bigger On The Inside. Thousands Of Years As The Leading Establishment Of Practical Magic In A World Where Dimensions Were Largely A Matter Of Chance In Any Case Had Left It Bulging In Places Where It Shouldn't Have Places. There Were Rooms Containing Rooms Which, If You Entered Them, Turned Out To Contain The Room You'd Started With, Which Can Be A Problem If You Are In A Conga Line.

The Most Prudent Thing Any Intelligent Animal Can Do, If It Would Prefer Its Descendents Not To Spend A Lot Of Time On A Slab With Electrodes Clamped To Their Brains Or Sticking Mines On The Bottom Of Ships, Or Being Patronised By Zoologists, Is To Make Bloody Certain Humans Don't Find Out About It.

It Doesn't Stop Being Magic Just Because You Know How It Works.

Of Course, Like All The Informal Inhabitants Of The University The Roaches Were A Little Unusual, But There Was Something Particularly Unpleasant About The Sound Of Billions Of Very Small Feet Hitting The Stones In Perfect Time. Rincewind Stepped Gingerly Over The Marching Column. The Librarian Jumped It. The Luggage, Of Course, Followed Them With A Noise Like Someone Tapdancing Over A Bag Of Crisps.

The Library Didn't Only Contain Magical Books, The Ones Which Are Chained To Their Shelves And Are Very Dangerous. It Also Contained Perfectly Ordinary Books, Printed On Commonplace Paper In Mundane Ink. It Would Be A Mistake To Think That They Weren't Also Dangerous, Just Because Reading Them Didn't Make Fireworks Go Off In The Sky. Reading Them Sometimes Did The More Dangeous Trick Of Making Fireworks Go Off In The Privacy Of The Reader's Brain.