You can’t have one without the other – they are the perfect pair. They are achieved when all the elements within a composition or space talk to each other, and to the entire space.
Harmony is the way in which differing shapes, textures, patterns, colors and forms make sense together and form a satisfying visual arrangement. Harmony can be created when a number of elements are united by a common characteristic. For instance, you may wish to use different chairs around your dining room table for a fun, eclectic look, but unify the setting by using the same fabric on all of them.