BALANCE

This is Symmetrical Balance:

Symmetrical Balance is referred to as a mirror image. Symmetrical Balance is acheived when you can draw a line through the middle of the visual object and both halves create a mirroring effect of one another. This is true for the cathedral above.

This is Asymmetrical Balance

 Asymmetrical Balance happens when several smaller items on one side of a visual object are balanced by a prominent object on the opposite side: they can differ in size, weight or color. Asymmetry creates an intentional "lack of" or a different mood than that of a balanced visual object.