Each morning, millions of office workers start their working day. Some with a coffee, some with a short catch-up with their befriended colleagues, some in a start-up call. Across the day, everyone follows their own rhythm. A manager who moves from meeting to meeting, a remote software engineer who works by himself all week, or a project manager who spends her morning in meetings and the afternoon preparing her product. The magnitude of different jobs and different organisations provide a colourful spectrum of activities and schedules. Nevertheless, although there is a wide variety of schedules, we can find an odd symmetrical pattern in our occupancy data that roughly most employees follow across their working day.