Why this exists
I got tired of "are you on a call?"
I work from home. My family doesn't have my calendar, and they shouldn't need it. What they need is a glance at the hallway: is he in a meeting right now, and when does the next one start?
So I built a departure board. An old iPad lives outside my office door and shows the day the way an airport shows flights. In progress is loud. Up next is boarding. Done is gone. It turns out that's all anyone needed.