Serpina is a so-called rolling ball clock. This clock type is relatively unknown although the first examples were built in the 17th century. Serpina was inspired by the design of Sir William Congreve from the early 19th century. These clocks are popular collectors' items. It makes just fun to watch the ball, rolling down his way and then to see how the Seesaw starts the process all over again. It was not without reason that these clocks were formerly in shop windows to impress pedestrians. Your friends and visitors will be impressed, too. Rolling ball clocks are primarily great entertainers. Although Galileo Galilei already discovers, that a ball needs on an inclined plane always the same time for the same distance. In practice, however, all rolling ball clocks have a problem with the accuracy, because dust on the seesaw destroys the theory. The name Serpina is a modification of serpentine and refers to the path traveled by the ball when rolling down the seesaw.