Human brain receives signals faster through eyes rather than ears. Visual appearance is supposed to be more appealing when compared to any other senses, no matter what the medium of presentation is. So, there are methods by which one can increase the visual appeal. Other senses facilitate visual appeal, and are also important to concentrate on.
Typical example is color when accompanied with audio, and writing. According to a study, big budget companies spend billions in the color market research, which helps in product and packaging development. Color, along with content, helps to pertain the interest of the visitor and makes him surf the website longer. A colorful article will make the reader read it till the end. Color makes things look more amiable.