The Ball Chair was designed by Finnish furniture designer Eero Aarnio in 1966. The Ball Chair is also known as the globe chair is famous for its unconventional shape. It is considered a classic of industrial design. More recent versions have increased the overall size and added interesting features including music and mp3 player integration.

1. Eero Aarnio - The original Ball Chairhttp://www.ruksliving.com/ball-chair.aspx
2. Eero Aarnio - Hanging Bubble Ball Chair
3. Gaiam - Balance Ball Chair - Retail Price $100http://www.gaiam.com/product/fitness-center/exercise-balls/kits-equipment/exercise-ball-ballanceball-chair.do
4. Gym Ball Chair - Fitness Chairhttp://www.thedesignblog.org/entry/new-spin-on-office-furniture-gym-ball-chair/

"The idea of the chair was very obvious. We had moved to our first home and I had started my free-lance career in 1962. We had a home but no proper big chair, so I decided to make one, but some way a really new one. After some drawing I noticed that the shape of the chair had become so simple that it was merely a ball. I pinned the full scale drawing on the wall and ‚sat' in the chair to see how my head would move when sitting inside it. Being the taller one of us I ‚sat' in the chair and my wife drew the course of my head on the wall. This is how I determined the height of the chair. Since I aimed at a ball shape, the other lines were easy to draw, just remembering that the chair would have to fit through a doorway. After this I made the first prototype myself using an inside mould, which has been made using the same principle as a glider fuselage or wing. I covered the plywood body mould with wet paper and laminated the surface with fiberglass, rubbed down the outside, removed the mould from inside, had it upholstered and added the leg. In the end I installed the red telephone on the inside wall of the chair. The naming part of the chair was easy, the BALL CHAIR was born."http://www.eero-aarnio.com/8/Objects/Ball_Chair.htm

"After I had made the Ball Chair I wanted to have the light inside it and so I had the idea of a transparent ball where light comes from all directions. The only suitable material is acrylic which is heated and blown into shape like a soap bubble. Since I knew that the dome-shaped skylights are made in this way I contacted the manufacturer and asked if it would be technically possible to blow a bubble that is bigger than a hemisphere. The answer was yes. I had a steel ring made, the bubble was blown and cushions were added and the chair was ready. And again the name was obvious: BUBBLE."http://ballchair.info/