Even if sameness is necessary, variety is also essential. This keeps the eyes from moving around and rests on a space that has a factor of "sameness." When you contrast hard and soft materials, combining old and new architecture or furniture. You can implement variety in your spaces. On the other hand, you want to ensure that there is a contrast within your theme. At times, excessive amounts of variety can result in a space looking cluttered and confusing. To unify a collection of spaces, use color schemes. Use a color along with various textures, sizes, shapes and shades to create harmony.