The wall in the basement hiding the bomb is cylindrical, with the exposed part being elliptical, encased within segmented walls.
Japanese architecture is quite distinctive, due to frequent earthquakes, the materials for high-rise buildings are very 'light.' The term 'light' refers to comparing with ordinary building materials. For example, screws; Japan once developed special resin screws, which perform similarly to steel screws but are twenty times lighter.
The only heavy part is the 'load-bearing section.'
Take Sunshine City as an example. At the initial design phase, it adopted a single pile foundation for load-bearing, coupled with the "shell vibration control structure" technology, which not only achieved top-notch earthquake resistance but also ensured the flexibility and spaciousness of an internal column-free space.
If one had to describe it, Japanese architecture is like a pillar plunged into the soil, with cardboard attached around it.
