I’m talking about the far right wall of the building in [this](https://www.psindustries.com/wp-content/uploads/2020/08/DJI_0288-scaled.jpg) picture.
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A thin wall is not structural as strong as a thicker wall in regards to a lateral load, ie a force parallel to the ground. A material efficient way to make an wall stong for a load like that is not to just make a thicker wall but to make part of it thicker.
You can compare it to a truss. What primary contributor to the strenght, in regards to bending, is how far away the outer edges are, the material in the middle has very little effect. This is why a truss is mostly air.
Take some cardboards ad compared how a flat sheet is to bend compared to if you tape some together so the cross-section is like a T.
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