Atmos Colani Air Clock

Notes

Also known as the “perpetual clock,” it doesn’t require any winding, batteries, or electricity. It operates based on extremely small changes in temperature and air pressure, causing the chloroethane gas inside to expand and contract, thereby continuously storing energy for the clockwork. This allows the clock to keep accurate time throughout the year, with an error of just a few minutes per year. It is indeed a classic invention in the history of timekeeping.