Atomic clocks use the frequency of an atomic oscillator to measure the passage of time, and are the most accurate clocks in existence. This atomic clock showcases the time, the date, the day of the week, and the temperature.
This rendering of a cuckoo clock shows that is it just past four o'clock. The pendulum swings and the hour is chimed with a 'cuckoo' sound. This cuckoo clock also has a man and woman who come out on the balcony and dance around on the hour.