Depending on the time of day, one of the building’s highlights is its double skin of black aluminum that acts like a theatrical veil, creating a cut-out on the main building by day and shining by its absence at night. From the highway, the grill lends movement to the façade thanks to the moiré effect when cars travel quickly by it. The layers that make up the envelope give the effect of depth, opaqueness, and light to pedestrians walking by. The metal skin is made in such a way that it gradually reveals the interior. During the day, the metal grill gives the impression of opaqueness and creates a play of shadows. This material brings to mind the metal used in the neighbouring industrial buildings. At night, the skin filters the light that comes from inside and transforms the building into an immense lantern. Perforated with large openings, the veil allows light to be filtered inside and creates a play of varying shadows.