Making you work to stay upright, the Opus stool constantly keeps you alert. Created by designer Dor Ohrenstein, the stool was built to force you to keep your balance while sitting. As a result, you can sit for long periods of time without suffering the negative side effects of sitting.
Ohrenstein's stool keeps you active through an uniquely crafted base. Instead of several stable legs, the Opus only has one large one. Connected to the leg is a large ball. When left alone, the stool can stand without any support. However, when you sit on it, you'll have to consciously keep yourself upright.
The Opus stool was inspired by traditional Chinese medicine where the mind and body are interconnected. By letting you balance yourself, the stool keeps your mind alert and your body in good shape.