Weighing in at three tons and boasting a mechanism 14 metres long, the Wishing Fish Clock is thought to be the tallest mechanical clock in the world. It's also very popular. Every year, over a quarter a million visitors watch its amusing hourly cycle, which culminates in a 12-feet fish blowing bubbles at the onlookers to the sound of "I'm Forever Blowing Bubbles". This mechanical masterpiece was designed by the inventor and author, Kit Williams, and built by the famous clockmaker, Michael Harding, in 1987.