SSE is four spheres. Class it how you like, I’m telling it how it was designed. The four sections only look like a single sphere (the word Geosphere was invented by Disney)
The real accomplishment comes when you look deeper. Six legs hold up a platform 52 ft in the air. On this was built a steel framed building that bowed out at the centre. This supports the floors and all the weight of the attraction. Also attached to the base, but not structurally attached to the "building" structure, is the internal geodesic dome that creates the weathertight surround. This was finally wrapped in a waterproof rubber membrane. On top of this is the silver dome shape guests are familiar with. The two outer domes are purely for weatherproofing and show. The real building structure is hidden inside and not structurally connected for any load bearing to either dome
A second internal structure was hung from the 52 ft platform, again wrapped in rubber. And outside of this is the alucobond finish.
Another fun fact is that the six legs are tied together below level as an added safety feature to prevent any leg from slipping away from the others should the foundation fail.
Life has a single layer roof structure that both holds itself up and supports utilities and the ceiling. The outer panels are the same as the interior panels.