Inspired by a unique location where nature and architecture join in harmony, we designed the interior project of a spa complex in Montenegro. We managed to reflect the philosophy of the project and emphasize the architectural features with the help of natural materials, dynamic volumes and the play of light and shadow. Local gray marble, which is resistant to moisture, was chosen as the main cladding material. The variability of stone cutting allows to emphasize both the monumentality of the main elements and the integrity of small details. Light is a key tool for the interior. Stained glass windows along the perimeter of the facade create the image of a soaring roof and freestanding stone blocks. Water enhances the effect of reflections, influencing the perception of the facade and the space. The ceiling above the pool has perforations that transmit light. The metaphor and idea of embodying this effect served the light passing through the tree crowns.