The author of A Brief History of Time was guest of honour when the unique clock, which has no hands or numbers, was revealed at Corpus Christi College.
Dubbed the strangest clock in the world, it features a giant grasshopper and has 60 slits cut into its face which light up to show the time.
Its creator John Taylor said he "wanted to make timekeeping interesting".The Corpus Clock will stand outside the college's library and will be on view to the public.
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