Chances are good that the screen layout reveals the implementation of a design principle called alignment . A page with graphical and textual elements aligned vertically or horizontally can create a strong impression. Consider the figures below. In the left figure, the boxes appear to be placed haphazardly.
Some boxes have different widths.
Now look at the right figure. Notice how a simple rearrangement improves the design. Even the alignment of the box labels within the boxes contributes to a cleaner look. When pages begin to look cluttered, the end user is faced with too much information, too many places for the eye to roam. I add plenty of space between graphical elements to force my layouts to simplify visually.