Building a chair is challenge that tests a woodworker's capacity for precision as well as design. With the possible exception of beds, chairs are the type of furniture people have the most direct interaction with. Due to this close relationship with chairs, we demand a lot from them. In the introduction to his book "Chairmaking and Design", Jeff Miller describes the challenge of building a chair, "Chair design at its most basic is an attempt to solve very practical problems: how to make a seat that is both comfortable and durable".
Of course chairs, like all other pieces of furniture, are judged on their attractiveness as well and for one to be considered a success, it must strike a balance between all three of these attributes.
I tackled chair building relatively early in my woodworking career and enjoy the challenges that it entails. Each chair I've made has taught me important lessons and lead to many woodworking epiphanies along the way.