We envisaged the permanent exhibition spaces as extensions of the pavilion from below: an underground contemporary monolithic space, in béton brut, accessible directly from the low ground level outside. This new gallery is fed by natural light via a series of elongated skylights emerging in the green landscape opposite the pavilion. From the garden, the visual perception of these small volumes changes with the time of day and the seasons, according to the colour of the sky or the position of the sun. The mirror polished stainless steel surface in turn reflects the image of the green spaces, the sky or the Hauldres Pavilion. Visually and intellectually, the museum deploys an accumulative and systemic landscape to reveal the creative abundance and genius of mankind, bringing together in the same space two centuries of technology and society.