This internal design project use the fundamental principles of Roman baths, places dedicated to psycho-physical regeneration, as crucial references. In this new fitness and well-being club, the different successive spatial areas, the homogeneous colors, the light and the naturalness of environments provide tranquility and sensorial harmony, helping guests reconcile body and mind. The Giallo Girasole (sunflower yellow) stone connects all spaces, accompanying visitors through the rooms as if it intended to create an additional sensory pathway – now on the floors, then on the lined walls or in the swimming pools themselves. The stone was also selected for the central space, mostly occupied by water and the reflexes from the large skylight, making it the definitive protagonist of the project. The bathtub, with the jacuzzi and the steps with lead the guest into the water, seems to be the result of the sculpting of a single piece of stone: it is actually lined with 4 cm-thick stone slabs. Around the perimeter, the floor is lower than the rest of the flooring, to collect overflowing water. Precise cuts on the material reduce the impact of fixture integrations. The stone surface, sandblasted and made rough and therefore non-slippery in the areas closest to the swimming pool, is polished in the rest of the floor. The same stone, in large stabs, is also used to line the pilasters, which alternate with portions of painted lining and large glass windows to create suggestive areas in the perimeter walls. The slabs are 2 cm thick and cut according to the measurements defined in the records; they are sandblasted and laid in an offset manner to suggest a sort of visual movement in the walls of the corridor and the crystal dividing walls. The same stone is also used to create mosaics in the showers: it therefore accompanies the sinuosity of the curved walls, once again highlighting the multiple uses of stone materials.