Elevator Floor Illusion

Before entering in this elevator I'm sure that most of us will check twice if the floor is real or there is an empty space.Just for fun those who created this elevator illusion added a sign at the entrance cautions the people that goes in about work in progress.Now just imagine a man who got late at work because of traffic, and he got a meeting at 20 floor, and the fastest way is to jump as fast as he can in the elevator.Now imagine this. :)