If you just concentrate on the two balls, you will feel that they are exactly at the same levels. But if you look at the extreme right, you will find staircase like levels But if the formation is attaining a height, then why it not evident at the ends. Do the steps actually happen to be there or they are just an illusion created by a 3d art? The truth is that such a figure cannot exist in the real world. It happens to give us two information that contradict with each other and thus it can't exist in the real world.