The cleared and roofed-over inner courtyard with the rotunda of the Reading Room in the centre forms the new heart of the British Museum. The fascinating steel-latticed roof has 3,312 triangular glass planes. A crown of luminaires around the upper rim of the Reading Room illuminates the courtyard area and the facades. To enable artifacts in the court area to be highlighted, the luminaires combine floodlight lenses with directional luminaires in common housings.