The Glaspaleis is a good example of early modern architecture, made of glass, steel and concrete (except for some marble, wood and copper on the ground floor). Each floor has about 30 mushroom-shaped pillars, ever narrower as one goes up the floors. Part of the multifunctionality lies in the fact that, apart from the back, there are no walls inside the building, creating not only an open atmosphere, but also leaving more freedom in filling in the space. None of the walls are load-bearing, neither the ones at the back, nor the basement walls, even though they are made of reinforced concrete, to resist soil (6–9 m) and water pressure, insofar as the pressure has not been absorbed by the outer walls of the insulation gaps (covered at street level) that are meant to protect the building against traffic vibrations and noise and for ventilation of the basement.