move in curve / public bench

The point of this design is that just one touch can switch the role of this public facility
between bench and bicycle rack.
As a user unlocks a lock device by folding up front of stool and push the stool backward
along the rail, then a stainless-steel circular structure comes into view.
These rings can sustain much weight than usual posts and also be a bicycle rack.
In changing a bicycle rack, It's very eco-friendly design by increasing accessibility of
people who park the bicycle on the bicycle rack.