In the center of the frame, a large wall clock shows its hands moving from exactly twelve o'clock to one o'clock. The minute hand sweeps completely around the clock face while the hour hand moves from one number to the next. Office workers below complete various tasks during this time period - one finishes a coffee break, another completes paperwork, and a third wraps up a phone call. Their activities clearly demonstrate the full sixty-minute duration that has passed. a complete hour as a period of time equal to sixty minutes