With its innovative Similar-Swing mechanism where the seat moves on a circular path at the back end, the swivel chair “swing up” encourages an active sitting experience supporting sideways movement. Combined with the flexible mounted, height-adjustable backrest, it provides an ergonomically innovative concept with partner chairs such as cantilever, four-leg and simple office chairs. The structural link between all models is the one-piece plastic shell that integrates the back and seat rest as well as different bases.