Czech designer Petr Badura, has created the Mono Chair, made from a single piece of bent aluminum. The chair only has two rear legs with the missing front two legs coming from the person who sits on it.
Description from the designer:
“The whole idea of this product is in the fact that the chair is an object that serves the man and is fully dependent on him. So, this chair can’t work without a person. A person is thus required for the very chair to be complete.When someone is sitting on this chair, their legs have to be bent at the knees at 90-degree angle. In this position the body weight is distributed and pressure on the legs is minimal.”