Composition of Lines
Visible and Imaginary Lines
Describing the composition of lines in a picture can be quite complex. On the one hand, there are visible lines in the motif, such as outlines or edges of objects. But on the other hand, there are imaginary lines that (can) result out of other elements of the picture, e.g. the protagonist's line of sight, areas with certain colours or light and dark areas of the picture. Such lines provide an image structure that can direct the viewer's gaze, making it easier for them to perceive important details in the image.
Horizontal and Vertical Lines
Straight lines generally convey a rather static impression. While horizontal lines can support the effect of calm or boredom, depending on the motif, vertical lines often create the impression of steadfastness and vitality, but can also have a restricting effect.
Increasing diagonals (from bottom left to top right) create dynamics and the impression of ascent and power. Falling diagonals (top left to bottom right) create the effect of descent and powerlessness.