The ON chair is a product of Wilkhahn introduced in 2009.
The chair was designed during the period of 2005-2009 by C. Gehner, H. Buttner, M. Englisch, A. Siefferer and C. Shayeb under the leadership of Hans Wahlen and Erich Becker. It is engineered to mirror the functions and positions of the knee and hip joints. [1] The chair departs from the traditional two-dimensional design and has a patented three-dimensional dynamic sitting arrangement.