The design idea of the Bau-Sessel armrest sofa is to surround the backrest of the sofa with a round tube, changing to a common backrest method. It feels that the whole upholstered sofa is bound by a round tube. The second half of the round tube surrounds the backrest half circle, which makes the round tube not monotonous and echoes the upholstered backrest. Origin of Bau-Sessel name: Bau is taken from Bau in the Bauhaus, which means construction. Sessel means armchair in German. Combined with the future Bau-Sessel, it means to build a chair, and translation alone means a chair in progress or completion.