Elevators

In our company, there are three elevators. One of them always returns to ground floor automatically if not used. Makes sense, most people will enter here. If nobody enters immediately, the door closes.

If someone wants to use the elevator, he has to press the call button. This triggers that the elevator waiting on the ground floor automatically goes to the highest floor without opening the door while elevators from other floors are called to the ground floor. Maybe the elevator waiting on ground floor is frightened by the sudden press of the button? Anyway... maybe it helps you to understand the meaning of the word "ceature".