The clock, unveiled by Professor Stephen Hawking on 19th Sept 2008. Built by inventor John Taylor is a tribute to John Harrison, who invented the grasshopper escapement in 1725. The clock cost $1.8 million and has no hands or digital numbers. a gift from John Taylor the clock is the showpiece of Corpus Christi's new library. Corpus Christi College, Kings Parade, Cambridge, England, UK.