This article (and the underlying research) is very interesting. The article describes a clock as a “flow meter for entropy”. That is, that a clock is anything

This article (and the underlying research) is very interesting. The article describes a clock as a “flow meter for entropy”. That is, that a clock is anything that measures the rate at which entropy is increasing in a system. The other major idea is that the more energy introduced into the clock, and the more entropy produced, the more accurate the clock.