An interesting, and surprisingly simple height adjustable chair by Rotterdam based Studio Lorier. Its called the Hyrbid Chair and heres how they describe it.
A very comfortable chair which combines a desk, dinner and lounge chair. The chair is the ideal mix for who does not want two separate chairs, but still wants the comfort of both relax and active seating positions. The hybrid chair can easily be adjusted, by sliding a strong textile band which locks in place. The adjustable seating angle will gradually slide backwards, when the seat is lowered. The chair is comfortable upholstered in a wide choice of the best wool fabrics. The three legged frame is made of locally sourced solid oak wood.