To be honest, it is difficult to make design ventilation for such famous and huge influential project. Actually, the temperature and moisture in transparent cupola is not stable at all because of the flat and single layer glass, especially in summer time and wintertime. Here the open space used for natural ventilation is quite not thermal-massive and easy to keep warm. Therefore, I am thinking of replacing the flat and single layer glass by insulating glass which can let sunlight come through and keep heat from outside. Due to the possible financial problem of budget, flat and single layer glass is applied to the whole ceilings of cupola.