The principle of balance refers to the ordered distribution of elements of equal visual weight to achieve a visual equilibrium. Balance is only achieved when the visual weight of the elements are evenly distributed along a central axis or point that can be both real and imaginary.
Designers cheat sheet:
Balance can be achieved by three popular ways namely Symmetrical, Asymmetrical and Radial. In Symmetrical, a space is divided into two equal halves centered on a central axis and both the halves are equally compensated to give out a calm feel to the living space. In Asymmetrical, any odd number of elements can be used by keeping an imaginary central axis as the focal point. Though asymmetrical balance is a little hard to achieve when compared to symmetrical, the output is more natural and energetic when compared to the former. Radial balance involves a central piece (like a chandelier or a round dining table) from which all other elements seem to radiate to arrange themselves in circular symmetry.