Balance requires equal distribution of visual weight.
The objects are repeated in the same position on either side of the design. One side is a mirror image of the other.
Sometimes while attaining perfect symmetrical balance you can loose unity and visual interest.
An asymmetrical design is normally more interesting.
Once objects on one side of the image are heavier it is important to create ways to move the viewer's eye around the design.
Asymmetrical balance can be achieve by the placement of color, texture, direction and scale.