Porquerolles Island is a natural monument. Given its location in the heart of a natural park, the protection of the site is a key dimension of the project. Its registration in the Natura2000 network makes any new construction prohibited. The Contemporary Art Foundation is therefore proposed as an extension of a Provençal villa to secure a spatial configuration and an architectural language integrated into the building, while demonstrating its contemporary character. The project strives to carry over the spirit of the existing building, providing evidence of the previous occupation and engraving its memory in the territory. The project hence consisted in creating a 2000m²(21500ft²) space underground, without modifying neither the outline of the house nor the landscape. The museum integrates well in the natural topography, within the boundaries of the villa’s footprint, and invisible to the eyes except for a few opaque stone walls and terraces. Its openings give shape to specific views from the landscape giving a sense of direction and welcoming in natural light. The project brings together three tightly connected and dependent dimensions of the museum: its surroundings, its contents and its architecture. The building remains invisible. A technically complex and discreet system distributes spaces, with sober architecture, deprived of any artifice or attempt to show off. Inside the villa, spaces expand and unfold in the shape of a cross. The underground space reveals a series of showrooms. At the museum’s very center lays a water ceiling, a water surface embedding the building, letting in natural light and illuminating the spaces it under it. Water and natural light are architectural elements in their own right. They structure the building. Architecture plays with our senses. Interpenetration of spaces and the ease of circulation make visitors forget that the architecture is designed to have them focus on artistic works.