This clock is 600 years old, and it still works.Every hour in Prague, Death rings the bell.The apostles appear and pass by.Crowds gather beneath it as gears, saints, planets, and symbols move across one of the most dramatic machines ever built.Made in 1410, the Prague Astronomical Clock remains the oldest working astronomical clock on Earth.It tells the time, but that is the least interesting thing it does.It turns the passing hour into a public reminder that every life is being counted.