The social rules in elevators start out similar to male urinals: maximise the distance between you and anyone else present. The major difference in terms of movement is that once you choose a urinal and start to pee your standing position is largely fixed whereas with the elevator your position is likely to change as more people enter. (When people leave a once-crowded elevator the remaining bodies tend to retain some of their proximate stickiness).

Given the desire for distance – what would it take for urinals to adjust their position depending on who else is in the room?