Chairs are simple. They are the things for us to sit and rest. But some chair designs are unique and different. Those chairs are generally made from a different material which surprises everyone.
The Challenge is Designing a Simple Element
Thinking of a boxing glove as a chair is not possible but someone in the world has done it, too. That is not the only unique product when we talk about chairs because as in the beginning we said chairs are simple. Designing a simple element is hard but challenging. And that challenge is the motivation of designers.