Bring light in to the middle of the home. The walls of windows behind this staircase would be completely cut off from view had these stairs been constructed with a traditional structure. Light spills around, through and under these stairs, allowing what would likely be a dark part of the home to shine.
A closer view of the same stairway makes it apparent why it's made into an object: It is a very well-detailed contemporary stairway in steel, wood and cable. With thin treads and slender riser supports, the stairway also lets in plenty of light through the windows, another good reason to cut back the wall on the side and let the stairs land in the space.