No stranger to designing for time, Marc Newson recently collaborated with luxury watch manufacture Jaeger-LeCoultre to produce the Atmos 561 mechanical clock. Atmos clocks will stay accurate for years powered by incremental temperature changes inside a bubble block of Baccarat crystal.
Their power source is a hermetically sealed capsule containing a mixture of gas and liquid ethyl chloride, which expands into a chamber as the temperature rises, compressing a spiral spring; with a fall in temperature the gas condenses and the spring slackens. This motion constantly winds the mainspring. A variation in temperature of only one degree in the range between 15 and 30 degrees Celsius is sufficient for two days of operation.