Wood Shading and GrainEach piece will have slightly different grain patterns. Variation in colour shading and grain between different products and within the same product can occur; this is a normal feature of natural wood furniture.KnotsKnots are a natural property of all real wood furniture; they do not affect performance, and add interest to each piece.ExpansionAll timber will display movement from season to season because of changes in atmospheric temperature and humidity. This occasionally may make drawer movement a little stiff, to ease movement simply rub a little candle wax on the drawer runners attached to the carcass of the furniture on either side of the drawer.