Line Art of visual communication In short, line is one of the basic elements of visual communication.Generally, Lines are used to direct the flow of content, divide space, and emphasis on a specific area. As a whole, Lines, Implied Line, Contour Lines, Horizontal lines, Vertical Lines, Diagonal Line,Psychic Line are 7 types of lines. Each of lines represent different kind mood or sense. Anywhere, here selected 5 sample Line graphic.