To clarify the construction: Four square pyramids are placed together on the surface of a square and their four peaks are then removed. The entire structure is then turned around and the pyramid stumps are placed on the four “tree supports” arranged symmetrically in the courtyard. The roof is “standing”. In the second step, the tree supports are lengthened with a pylon on top and steel rods spanned from there to the foot of the pyramids – the roof is “suspended”. This balance between suspension and standing is the static secret and serves as the basis for the streamlined dimensions of the individual components that make up the roof structure. Nevertheless, a total of 210t of steel and slightly more than 2,000sqm of insulated glass were used, making the weight of the roof quite substantial. And, despite being anchored to the four corners of the roof, it is still subject to a certain amount of movement. The windproof and weatherproof connection to the existing buildings thus represented an enormous challenge in the roof’s construction. The glass roof, which is placed on the eaves by means of hinged columns, is connected all the way around by 30cm high bellows seals, which move freely in all directions, but are tightly sealed.
For this project, seele also created two surrounding galleries with glass balustrades, some of them curved, stairways, elevator glazing and glass floors.