Answer:
balance
Step-by-step explanation:
Balance is one of the main principles of the design. It makes sure that elements and forms on the art piece all coexist in harmony and create equilibrium in the composition.
The elements of the art piece should be in a good relationship and have good unity as the complete piece.
This should be true, whether the balance is symmetrical (two sides being the same) or asymmetrical (different elements weighting differently across the art piece). Balance makes sure that even in asymmetric there is good interaction between sizes, colors, and positions of the forms.