How do the two sides of the wood different?

The two sides of wood typically differ in texture, color, and grain pattern. The "bark side" or outer layer is usually rough and may have a darker, more textured appearance due to exposure to the elements. In contrast, the "heartwood side" or inner layer is generally smoother, lighter in color, and features more uniform grain patterns, as it is protected from external conditions. These differences can affect both the aesthetic qualities and the functional properties of the wood in various applications.