The Glass Clock is a pressurized water clock that drains itself onto the floor or a glass rondel, whichever is louder really… based on a set timing of 1 drop of approximately 1ml every 10 seconds which. This equates to six drops per minute, 360 drops per hour, and 4320 drops per day. The central beaker holds 4.5 liters of water. The water clock made of glass must be refilled daily. Time passes, water evaporates, and we keep on stepping in each others puddles, pinging away.