Because a box beam is assembled from individual components, it is possible to construct the beam as a more or less square device, or go for a rectangular design. In terms of appearance, the beams can be painted any color that will fit into the general design idea. When the beam is constructed with wood products, it is also possible to stain and seal the device once it is assembled. This allows the natural beauty of the wood grain to be enhanced, a trait that is likely to work well when the décor is casual.