17-18th Century Two-Protruding Head Style Side Chair made of Chinese Elm with an early proportion with lower seat with wider frame. Such chair is built with an ergonomic back rest that provides comfort and relief for the back for sitting. While Two-Protruding-Head and Four-Protruding-Head (with arms) style chairs are common and are probably the most comfortable old Chinese chairs in design. However, it is hard to find one that has the most sophisticated proportion and detail for its style.