Still inspired by the Bauhaus tubular steel furniture, I continued experimenting with the material, one idea was to make a “lightest possible” chair. 
One continuous steel tube that meets the seat from behind, takes the “shortcut” across the armrest and turns behind the back, can provide all necessary contact surfaces with a minimum use of material.
Using 3D modeling and physical testing, I found suitable dimentions. The seating surfaces are adjusted to ergonomic angles, but the otherwise straight corners of the frame makes it “encapsulate” a volume of air, emphasizing the space below and behind the seat, and the visual lightness of the design. 
The construction worked out quite well, but the idea of an “inverted cantilever” proved uncomfortable. The suspension in the steel works in the wrong direction, it feels like the chair wants to throw you off instead of “receiving” you. All in all: an interesting but impractical idea.