The walls are built of local spruce from the Franches-Montagnes, while the supporting beams are made of larch wood from Valais. Not a single nail has been hammered into the tree so the building is completely in sync with the wild natural environment that surrounds it … ###>Aucun clou n' a été planté dans l' arbre, la construction est donc totalement en accord avec la nature sauvage qui l' entoure...