From the description on YouTube:
The Corpus Clock has been invented and designed by Dr John Taylor for Corpus Christi College Cambridge for the exterior of the college's new library building.
It will be unveiled on 19 September by Prof Stephen Hawking, cosmologist and author of the global bestseller, A Brief History of Time.
The £1 million timepiece, known as The Corpus Clock, has been commissioned and designed to honour the John Harrison, who was famously the pioneer of Longitude and inventor of the esoteric clock mechanism known as a grasshopper escapement.
The clock has been designed by the inventor and horologist Dr John Taylor and makes ingenious use of the grasshopper escapement, moving it from the inside of the clock to the outside and refashioning it as a Chronophage, or time-eater, which literally devours time.
For more information, log on to http://www.corpusclock.co.uk