If an attempt is made to sell too much at one time, nothing will be sold. Stick to one or two ideas. Simplicity is the key to an effective display.
Emphasis is the stress or prominence given to an idea or design element.
It is making one idea, color, shape, or texture dominant and others subordinate. If all elements are of equal interest, no one of them will receive attention. Emphasize an element by making it brighter, larger, more textured, surrounded by empty space, point to it with lines, or make it project from the background. A center of interest must be chosen. Unity is singleness of effect or style, related style, or totality of related parts.