Water clocks have been around about as long as the ability to measure time, but this is a modern twist. There's no counting the drips or waiting for a bowl to sink every half hour. This is a dinky little digital clock, powered by water.
Simply fill the cells on the reverse of the clock with liquid - not only water, but tea, fruit juice even beer, and it will display the time. The digital clock has both time and date settings and measures a teeny 5cm high.