The Atrium hall – the biggest floor of the pyramid. Its area is 2185sq.m. The floor coverage is made of white and grey marbles. Kazakh people praise white tone with great respect as it is the colour of purity, nobleness and welfare. You can see windows around the hall with warm sunrays casting though into the auditorium of Opera hall. The thickness of the stained glass is 4.5 sm. Between the layers of glass stretched mesh with the picture of doves. The capacity of the hall is about 400-500 people.