Wall clock

That has gears and mechanisms around it. The watch has, at the top left, a part of a ships rudder that has numbers on it. On the right side it has gears that represent part of a clock mechanism. Bottom right has a copy of the Antikythera mechanism. A clock or a timepiece is a device used to measure and indicate time. The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units: the day, the lunar month, year and galactic year. The first known serrated clock was invented by the great mathematician, physicist and engineer Archimedes in the 3rd century BC. He created his astronomical clock which was also a cuckoo clock with birds singing and moving every hour. Another Greek clock that was probably made during the reign of Alexander the Great was in Gaza, founded by him, which is described by Procopius. It was probably a Meteorological Observatory, a building that shows the celestial phenomena and the time. The Antikythera mechanism is an ancient Greek hand-powered orrery, described as the oldest example of an analogue computer used to predict astronomical positions and eclipses decades in advance. It could also be used to track the four-year cycle of athletic games which was similar to an Olympiad, the cycle of the ancient Olympic Games.

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