20) Unity through Repetition

Repetition can gain a sense of unity by using repetitive parts of a design (colors, objects, etc) to relate to each other.

This scene of migrating birds is an excellent example of unity through repetition.  There are repeating colors (all the birds and the color pattern of the sky in the background) as well as repeated shapes (the birds).  Although the birds are not placed in a completely symmetrical or measured pattern, they still create a sense of unity as a group.