Thanks @voronoi! Most of the curved pieces are just aluminum extrusions bent at specific radii, but for the more tightly curved pieces (like in the spaghetti tangle above) we had to water jet the profiles and build each of the four sides manually. Though a lot of the fabrication for Jeppe Hein's work is done in house, the benches are sent out to a fabricator that can handle this sort of complex metal work.