Chair and joint system for a chair or a seating apparatus

A joint arrangement (10), comprising a hollow cylindrical receiving cylinder (20) that extends in a cylinder axis direction (Z) and is designed to receive one end of a chair column (30) of an active-dynamic wobble chair, the latter being movably mounted in a substantially hollow cylindrical outer joint shell (40) that is composed of two or more parts made up of joint shell segments (45), the movable mounting of the receiving cylinder (20) being achieved by deformable elastic elements (50) that are arranged in a bearing gap (60) between an outer wall portion (21, 22) of the receiving cylinder (20) and an inner wall portion (41, 42) of the outer joint shell (40) and the receiving cylinder (20) can be actuated in a force-dependent manner in a cylinder axis direction (Z), which changes the shape and/or position of the elastic elements (50) as a result of a change, preferably a reduction, in the clearance of the bearing gap (60) as viewed in a radial direction (Rs) when the receiving cylinder (20) is actuated in a cylinder axis direction (Z).