Brian Richards A composite of the Pipe Organ in Hallgrímskirkja (church of Hallgrímur) in Reykjavik and Skógafoss waterfall in the south of Iceland. This large pipe organ has mechanical action, four manuals and pedal, 102 ranks, 72 stops and 5275 pipes. It is 15 metres tall and weighs 25 tons. Its construction was finished in December 1992. As such this a machine that turns key presses into sound waves. State Architect Guðjón Samúelsson's design of the church was commissioned in 1937. He is said to have designed it to resemble the basalt lava flows of Iceland's landscape. Skógafoss (pronounced [ˈskou.aˌfɔs]) is a waterfall situated in the south of Iceland at the cliffs of the former coastline. As such this is a natural machine that converts potential energy into kinetic energy.