What is the difference between proportion and balance

Proportion; is the relative size of objects as compared to other parts of the piece

Balance; is the arrangement of the elements within the piece that give it an aesthetically pleasing equilibrium for the observer

The linear perspective changed the quality of art because it gave art a sense of reality. it gave the illusion that the background and surroundings were actually close and/or far and a sense of depth. linear perspective change the quality of art following its birth the renaissance period as they want the art to be more realistic and they believe one way to achieve it is to use the method of linear perspective. it uses the principle of math to realistically portray space and depth in art.