In the Calanca Valley, half of the quarried Calanca gneiss remains unused due to aesthetic imperfections. The project gives these rejected stones new life by stacking them into a massive wall structure that shapes a river pool four kilometres upstream in Calancasca. Carefully placed, the roughly split blocks interlock naturally, forming a porous surface that filters light and shadow. A cantilevered slab of gneiss provides shade and frames the sky, held in balance by a counterweight. The result is a landscape of stone and water — raw yet refined — where the material’s geological history becomes tangible in the shimmering reflections on its rough surfaces.