The Turnstone Buoy is a seat with a flat top and a curved base that forces the user to work their abs and legs to keep his or her balance while sitting on it.
Described as something “designed for today’s movers and shakers” and meant for “active sitting,” the Buoy constantly moves up and down, tilts, and swivels and turns when being used. The point is for it and the user to be constantly mobile even when seated.
The chair works for everyone and has a height than can be adjusted using a lever at the side.
The chair is available in six colors and comes with a cap that can be customized in more than 25 fabrics, including designer fabrics by British designer Paul Smith, or swapped out. The seat sells for $179.
Turnstone is a brand by office furniture company Steelcase.