Initially, lifts did not have mirrors.
And whenever individuals use to take elevators, they complain about the speed of it.
And elevator speed makes them uncomfortable.
But after keen observation and solemn discussion by engineers.
They found that the people are too conscious about the lift going up and down, which troubles their minds.
And the distraction of the mind became the cause of installing the mirrors in the elevator.
Engineers got success as the people now were not conscious of the elevator's speed.