It's not called Stumble Upon because it'll trip you--although that is likely at some point if you have one in your home. No, designer Alessandro Isola views this piece as a reflection of the experience of entering a room and feeling that someone has just been there. There's a rumple in the carpet--evidence that you are in occupied space:
If you look down you may see a crease, a fold or a wrinkle in the carpet for instance. Signifying a movement or activity that happened on the surface of that very floor space. Highlighted as a small furrow, ridge, or crease on a normally smooth surface, caused by crumpling, folding, or shrinking. This usually causes a slight annoyance and is firmly pulled straight.
But with the Stumble Upon, you can't straighten out that disruption. The carpet is backed by a sheet of metal. It can serve as a table, though.