Since the first series of oak chairs were uncomfortable to sit on and, as a result, did not sell well, Piet Hein Eek adapted the chair. The seat is made of three boards that are used to create a curve and the back is made by pressing two boards together into a curve and gluing them into place. The chair’s proportions had already been optimised, so all Piet did was add the curves. All of a sudden the chair became quite comfortable. From that moment on, it began selling well. It is one of Piet's best-selling chairs and has served as the model for virtually all of our later chairs.