I bet your chair is not as fun as the Spun Chair. This is a playful chair that lets you rock side-to-side or spin around without falling to the floor. Designed by Thomas Heatherwick for Magis, the Spun Chair is made of rotational-molded plastic, so you can sit and spin both indoors and outside. Your movement causes the spinning top to tilt and turn.
The above video shows the Spun Chair in action. Not cheap but looks a lot of fun to try.