When it comes to shape, chai can have different styles such as traditional, modern, or contemporary. The shape should not only be visually appealing but also offer proper support to the body. Ergonomics plays a significant role in chair design, euring that the chair promotes good posture and minimizes strain on the body during prolonged sitting.Materials used in chair design can vary widely, ranging from wood and metal to plastic and upholstery fabrics. Each material choice brings its own unique characteristics in terms of durability, comfort, and aesthetics. The selection of materials should align with the intended usage and style of the chair.