The binary clock shows the time by lightning each lamp.

The roman numbers got a versatile function outside the mathematics. You can find them on dials from clocks, in the numbering of book chapters or the count of dignitaries and rulers like Pope Benedikt XVI.The roman numbers got a versatile function outside the mathematics. You can find them on dials from clocks, in the numbering of book chapters or the count of dignitaries and rulers like Pope Benedikt XVI.