The strength of the curved glass is evident from the fact that it must be able to withstand typhoons and forces of 800 kg/m2. Roof terraces are to be constructed on a number of theatres and are accessible via glass doors. S-shaped glass infill panels are attached to the steel portals for this purpose as well. ABT specified the structural detailing for these doors. The detailing had to take the possibility of a typhoon into account as well. A sphere projects outwards above the main entrance. The architect wanted to have this sphere constructed without dilatations. ABT developed an aluminium façade that is suspended from the underlying structure using an elastic system. When the sphere heats up, it will expand. Due to its elastic attachment, the spherical façade shell is able to expand outward in its entirety. The stresses caused by the increase in temperature within the aluminium plate consequently stay within limits.