A question for the ages! When elevators, or lifts as they were known then, were first thought of, the problem with the concept was speed. Generally installed in skyscrapers, lifts initially used to take a lot of time to reach the upper floors of the building. To make the general public ignore the slow speed, engineers installed mirrors in lifts basing this step purely on human psychology. Almost all people are obsessed about how they look. Thus, when they entered the lift, their attention diverted to grooming their hair or tie rather than noticing the slow speed of the lift. This was the original reason why mirrors were installed in lifts.