Wild animal track / Tire chain

The concept is that a part of shape of nature is applied to object to make emotional understanding between human and objects. The shape of nature is wild animal footprints and the object is tire chains.
When the car equipped with the footprints tire chains Pass the way, the foot prints which look like that a couple of wild animal passed remain. So, it reminds human of animal forgotten and the footprints can be a part of the city. To prevent the footprints from overlapping, the foot prints are designed for the tire chains in turn.