The glass - and - aluminum roof (1) ​ — which is nearly the size of two football fields — ​ is slit with north - facing windows that illuminate the main reading room (2).
ويبلغ قطر سطحه ‏ (‏ ١‏ )‏ المدوَّر المصنوع من الزجاج والألمنيوم حوالي ١٦٠ مترا .‏