Check the underside
While Rietveld's chairs became known for their iconic design, their production process was kept as practical and efficient as possible. For example, Rietveld and Van de Groenekan (Rietveld's regular carpenter) never colored the underside of seats or railings, so no time or paint was wasted. Because the underside of the furniture is not visible when the chair is standing, it didn't matter to the appearance anyway. It was also common for the chairs to be stained, with the seat usually left colorless or only primed.