Is the stairway a passageway or a border? Yes, it is a gate but also determines the border of floor differences. When we leave a space behind, it determine the border of entering a new place. So, I violated the boundary of the stair and set a new border. This staircase is the only place where everyone goes by. I wanted to examine how this cycle is repeated by presenting it to the user's experience. How will someone else violate the boundary that I have determined? Generally, most of users have gone from the openings I have set. Very few users have tried to move the border model.These users create a new formed and a new border with the replacement of some parts.