Many artists do not depend solely on color to create expression in their pieces. Lines are a useful way to attract the attention of viewers and guide them through the message presented. Sometimes the artist uses the mechanism of lines to box in an emotion or concept. At other times, artists use lines to represent the past or future of a feeling or idea. There is no right way to use lines in modern art. They are an expression that is felt by the artist, and they used to convey emotions and concepts to viewers. The lines can also be combined with color to heighten the effect of the piece.