The passing of Terry Pratchett, author of the Discworld novels, will be widely mourned. Among the creations in his books was the Great Organ of Unseen University, Ankh Morpork. The creation of that wayward genius B.S ('Bloody Stupid') Johnson, it had three manuals and such a myriad of controls that the only person capable of taming it was the University Librarian who, by a magical accident, had been transformed into an orang-utan. The extra long arms apparently came in handy.