[K0balt]

Concrete. Everything concrete. Anything not concrete is removable.

[mensetmanusman]

Concrete has poor tensile strength and is wash to damage with a hammer. Also as a building material is very expensive...

[gruez]

So the equivalent of putting them in jail cells, minus the bars?

[K0balt]

At the lowest levels, yes, because people at that level destroy everything they touch.. and if they are above that level then they can decorate as they wish, rugs and furniture are a thing.