You can achieve harmony in your design when you effectively combine unity and variety in one design. When there are different elements in a design and then the viewer first sees the whole rather than the individual elements then your design has harmony. Harmony pulls all the parts of the design together and each individual element complements each other. Correctly incorporating repetition and rhythm is also very important in achieving harmony. Rhythm helps direct the eye movement while repeating patterns helps the image flow. Source
Harmony: Source
Harmony: Online
Harmony: Real life
