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When, with the industrial and urban development buildings began to be built taller and taller, the use of elevators became a requirement. Elevators at the time were fairly slow-moving and passengers complained. The engineers of the time began considering solutions to the issue. An engineer claimed that the problem was not the tardiness of the lift, but the fact that people did not have anything to occupy themselves with during the ride, so that they sensed time moving very slowly! When the use of mirrors as elevator decoration was proposed, the first trials showed that complaints were minimised, and the use of mirrors became established practice. Passengers have something to keep them busy during the ride so that they overcome the psychological difficulty of inactivity!

Meanwhile, safety reasons impose the use of mirrors. The daily use of the elevator means that many times we enter absent-minded or distracted. But what will happen if, for some reason, the cabin is not behind the door? There is a danger of falling into the shaft. Therefore, the illuminated cabin mirror helps us realise the presence of the cabin in contrast to the dark shaft. 
Also, many people suffer from claustrophobia and limiting them in such as small space causes them increased anxiety. The use of mirrors “doubles” the sense of space and limits the claustrophobic sensation.