Providing, meaning to a mass of unrelated needs, ideas, words and pictures - it is the designer's job to select and fit this material together and make it interesting.
Art is an idea that has found its perfect visual expression. And design is the vehicle by which this expression is made possible. Art is a noun, and design is a noun and also a verb. Art is a product and design is a process. Design is the foundation of all the arts.
Simplicity is not the goal. It is the by-product of a good idea and modest expectations.