The building is a giant dome that lets some light through. When tests were carried out in Stuttgart, Germany, and on a scale mock-up in Abu Dhabi, Nouvel found that even the 5 per cent of sunlight he intended to allow through was too much. In the finished museum, “Only 1.8 per cent of light goes through all layers of the dome,” Hala Wardé says. “We reduced the light to achieve the effect and level of comfort we were seeking.”