notion of 'building'. Instead if it rising out of the ground defining itself with its interior volume it would sink safely below the surface and define its shape via a process of mass subtraction or boolean.
This resulted is a very interesting Architectural space. Two massive atriums are bored vertically down to the same equivalent height, using the same foot print/profile as the Towers once occupied in the previous overhead airspace. Windows still line the walls as they would have but now face in to where one would expect to locate the building.
The floors are comparatively smaller intersecting into the bedrock, but are very resistant to attack. In fact this building, which is still vast in its height and floor space is impossible to destroy as it not reliant on structural members within each level for the next levels support.
It would also be the first building which people could commit suicide into rather than off. One could jump into the building to reach death by gravity, of course a large barrier would be installed at street level to stop this happening, but the notion still presents itself.
The building would have many other revolutionary features, such as space saving and it would not obscure the horizon as the previous bulk box forms did. It would also require far less material to construct as most of its vertical structure would be the bedrock, the floors simply cling to the circumference elegantly.
Socially these could be spectacular spaces. At the bottom of each inverse tower there would be coffee shops and restaurants. High speed lifts occupying the corners of each chamber would bring people to the surface.
Unlike the previous Towers there would be links throughout all of the floors. By providing multiple access to both Towers the building/complex will work more efficiently. When working at the original World Trade Center if you worked in one Tower and had to say meet or deliver to another you would have to travel all the way down to only go all the way up in the next Tower.
At great expense the Petronas Towers attempted to over come this problem resulting in cumbersome sky bridge.
