Clocks would normally rely on the usual wind-up or energy-powered (battery or plugged in) sources to make themselves handy and tell the time when needed but here is a clock that makes use of another kind of methodology to carry out time-telling.
The Breathing Clock apparently does its handy work through the use of air. Time is indicated through an inflated balloon which in time deflates. The whole thing is regulated by a valve which could be either fast or slow.
For example, a workshop starts at 2pm. At this point in time the time is slowed down by use of balloon time. Whiteout the ticking clock the ability to concentrate and creativity are enhanced. Fully inflated the breathing cycle lasts no longer than half an hour.