We can see symmetrical balance in this painting by looking down the middle and creating an imaginative dividing line that cuts the image in half. If both sides of the piece are for the most part very similar, then we can say that it is symmetrical.
Salvador Dalí, “The Persistence of Memory” (1931), oil on canvas
The main focal area of this piece is the left hand side. In order to balance the piece Dalí added the back mountains and the other white clock, thing on the lower right to help asymmetrically balance out the image.
This photo gives us a sense of imbalance. The strong dominating subject on the right is overwhelmed by the expanse of blue ocean. Having the dominating and overwhelming together help create a balance of imbalance.