Abstract: A chair includes a base, a seat assembly comprising a seat, and a height adjustment mechanism attached between the base and the seat assembly. The height adjustment mechanism vertically moves a position of the seat from a first position to a second position that is higher than the first position. The height adjustment mechanism includes a first gas spring attached to the base, a second gas spring attached to the seat assembly, and a support attached between the first gas spring and the second gas spring. The first gas spring is at least partially within a lower portion of the base and the second gas spring is at least partially within the seat assembly. The seat assembly is movable relative to the lower portion of the base.

Abstract: An article of furniture includes a base support, an intermediate support moveably attached to the base support via a first moveable attachment mechanism, and a top support moveably attached to the intermediate support via a second moveable attachment mechanism. The first moveable attachment mechanism includes a first rotatable member that rotates about a first axis of rotation such that the intermediate support is rotatable relative to the base support and is rotatable relative to the top support. The second moveable attachment mechanism includes a second rotatable member that is rotatable about a second axis of rotation such that the top support is rotatable relative to the intermediate support and is also rotatable relative to the base support.

Abstract: An article of furniture includes a base, an intermediate member positioned above the base, a top member positioned above the intermediate member, and an adjustability mechanism that is attached to the base, the intermediate member, and the top member such that the intermediate member and the top member are each moveable relative to the base and such that the intermediate member is moveable relative to the top member and the top member is moveable relative to the intermediate member.