Take it as literally as you like with a door or a gate, or do something that
symbolises the ideas of going into or coming out of something, of arriving
or departing. Someone making 'a grand entrance', a funeral, a disgraced
politician slinking away, a retirement party, first day at a new job, Elvis
leaving the building.
Well, I hope some of us will have fun with architectural shots, and some
with people, entering and exiting.