What could be more immobile than a landscape ? Time does not seem to get a hold of it. And nevertheless, it is also moving, except that it does not travel at the same speed as the living, its scale is a million years. The forces acting on the earth’s crust are at the same time gigantic and extremely slow. Phenomenal subduction force acting on the tectonic plates, or slow erosion process, the earth takes all its time to modify its face.