Sa'dy is a small size office chair that puts its attention on human body structure and ergonomics. And it is specially designed for Asians by focusing on the height and the back of the chair. A slightly lower back makes the space more spacious. In the shape, the chair back bracket is from the chassis to extend upward, with the perceptual curve trend so that the line skillfully disappeared in the lower edge of the back frame by presenting an idea of soft and hard. The shape is simple, but full of ingenuity.