Diesis frames the sofa through a clear structural idea: a visible aluminium armature carries cushions and platforms, turning construction into form. H-shaped die-cast sides, a suspended frame and leaf springs define a precise exoskeleton, leather-clad to make the mechanics tangible yet refined. Down-filled volumes rest on this armature, creating a calibrated dialogue between rigor and comfort. Born from a shift from personal expression to analytical references, its clarity continues to inform subsequent seating systems.